ADMIN - GENERAL SESSION

POSTER - 01. AGRONOMIC CROPS

Wheat Variety Tolerance to Metribuzin and Pyroxasulfone. Lane S. Newlin*, Misha R. Manuchehri, Brett F. Carver, Amanda De Oliveira Silva, Hannah C. Lindell, Justin T. Childers; Oklahoma State University, Stillwater, OK1
Overlapping Residual Herbicides for Control of Glyphosate-Resistant Palmer Amaranth in Dicamba/Glyphosate-Resistant Soybean. Shawn T. McDonald*1, Prashant Jha2, Amit J. Jhala1; 1University of Nebraska-Lincoln, Lincoln, NE, 2Iowa State University, Ames, IA2
Interference of Amaranthus Palmeri in Sugar Beet. Whitney R. Schultz*, Nevin Lawrence; University of Nebraska-Lincoln, Scottsbluff, NE3
Soybean Response to Aminopyralid, Dicamba, 2,4-D and Aminocyclopyrachlor Application. Trey I. Clark*1, Thomas C. Mueller1, Larry Steckel2; 1University of Tennessee, Knoxville, TN, 2University of Tennessee, Jackson, TN4
Herbicide Application Associated with Varying Planting Dates in Oklahoma Soybean Production. Sarah E. Kezar*, Josh Lofton, Misha R. Manuchehri; Oklahoma State University, Stillwater, OK5
Interactions of Dicamba, Glyphosate, and Glufosinate as Tank-Mix Partners. Adam L. Constine*, Christy Sprague; Michigan State University, East Lansing, MI6
Boll Opening Efficacy as Influenced by Cotton Maturity. Cayden B. Catlin*, Bradley R. Wilson, Seth A. Byrd; Oklahoma State University, Stillwater, OK7
'Planting Green' into Cereal Cover Crops Improves Horseweed (Erigeron canadensis) Suppression. John A. Schramski*, Christy Sprague, Karen A. Renner; Michigan State University, East Lansing, MI8
Cover Crop Vs. Cash Crop: A Comparison of Two Renovation Approaches in Deteriorated Wyoming Hayfields. Tyler Z. Jones*, Brian Mealor; University of Wyoming, Laramie, WY9
Control of Velvetleaf by Tank-mixing Dicamba with Fluthiacet or Glyphosate in Dicamba/Glyphosate-resistant Soybean. Jose H. de Sanctis*1, Amit J. Jhala1, Stevan Knezevic2; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Nebraska-Lincoln, Concord, NE10
Greenhouse Herbicide Screening for Industrial Hemp. Joseph Mettler*, Kirk A. Howatt; North Dakota State University, Fargo, ND11
Timing of Post-Emergence Herbicide Application Impacts Weed Control and Seed Fecundity in Wisconsin Soybean Production. Sarah V. Striegel*, Maxwel Coura Oliveira, Ryan P. DeWerff, Nicholas J. Arneson, David E. Stoltenberg, Shawn P. Conley, Rodrigo Werle; University of Wisconsin-Madison, Madison, WV12
Impact of Tank Mix Partner on Solution pH and Secondary Movement of Dicamba and 2,4-D. Sarah V. Striegel*, Nikola Arsenijevic, Maxwel Coura Oliveira, Ryan P. DeWerff, David E. Stoltenberg, Shawn P. Conley, Rodrigo Werle; University of Wisconsin-Madison, Madison, WV13
The Potential for New Residual Herbicides in Rice. Connor Webster*, Eric Webster, Benjamin M. McKnight, David C. Walker, Bradley Greer, Samer Y. Rustom; Louisiana State University, Baton Rouge, LA14
Effects of Deep Seeding on Weed Management and Crop Response in California Rice Systems. Alexander R. Ceseski*, Amar Godar, Kassim Al-Khatib; University of California, Davis, Davis, CA15
Evaluating Reduced Rate POST Herbicide Mixtures for Palmer Amaranth (Amaranthus palmeri) Control in Dry Bean. Clint W. Beiermann*1, Cody F. Creech1, Amit J. Jhala2, Stevan Knezevic3, Robert Harveson1, Nevin Lawrence1; 1University of Nebraska-Lincoln, Scottsbluff, NE, 2University of Nebraska-Lincoln, Lincoln, NE, 3University of Nebraska-Lincoln, Concord, NE16
Effect of Sublethal 2,4-D Rates on Quality and Value of Cotton Fiber. Bradley R. Wilson*1, Misha R. Manuchehri1, Peter A. Dotray2, Wayne Keeling3, Gaylon Morgan4, Seth A. Byrd1; 1Oklahoma State University, Stillwater, OK, 2Texas Tech University and Texas A&M AgriLife Research and Extension Service, Lubbock, TX, 3Texas A&M AgriLife Research, Lubbock, TX, 4Cotton Incorporated, Cary, NC17
Options for Managing Weedy Rice in Louisiana. Bradley Greer*1, Eric Webster1, Benjamin M. McKnight1, David C. Walker1, Samer Y. Rustom1, Connor Webster1, Justin B. Hensley2; 1Louisiana State University, Baton Rouge, LA, 2Arkansas Ag Specialists, LLC, Dumas, AR18
Carry Over Effects of Residual Cotton Herbicides on Fall-Planted Cover Crops. Enelise Osco Helvig*1, Spencer L. Samuelson2, Cleber D. de Goes Maciel1, Muthukumar V. Bagavathiannan2; 1Universidade Estadual do Centro Oeste, Guarapuava, Brazil, 2Texas A&M University, College Station, TX19
Evaluation of New Rice Herbicides Applied in a Salvage Situation. Samer Y. Rustom*, Eric Webster, Benjamin M. McKnight, Connor Webster, Bradley Greer, David C. Walker; Louisiana State University, Baton Rouge, LA20
Characterization of Dicamba Cross Resistance in a Multiple-Resistant Waterhemp (Amaranthus tuberculatus) Population from Illinois. Lucas Bobadilla*, Darci A. Giacomini, Patrick Tranel; University of Illinois, Urbana, IL21
Effects of Simulated Dew on Dicamba Volatility and Soybean Sensitivity. Matthew Osterholt*1, Julie M. Young2, Bryan G. Young2; 1Purdue University, West Lafayette, IN, 2Purdue University, Brookston, IN22
Assessment of North Carolina Farmer's Glufosinate Use and Applications. Eric A. Jones*, Wesley Everman, Ramon G. Leon, Charlie W. Cahoon; North Carolina State University, Raleigh, NC23
Using Reduced Rates of Quizalofop to Control Weedy Rice. David C. Walker*1, Eric Webster1, Ronald J. Levy Jr.2, Benjamin M. McKnight1, Samer Y. Rustom1, Lucas C. Webster1, William B. Greer1; 1Louisiana State University, Baton Rouge, LA, 2Louisiana State University, Rayne, LA24
Cover Crops as a Summer Annual Weed Management Tool in Dryland Corn Cropping Systems of Semi-Arid Nebraska. Alexandre T. Rosa*1, Cody F. Creech2, Roger Elmore1, Daran Rudnick1, John Lindquist1, Rodrigo Werle3; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Nebraska-Lincoln, Scottsbluff, NE, 3University of Wisconsin-Madison, Madison, WV25
Cover Crops and Wheat Stubble Management Effects on Weed Demographics and Corn Productivity in Semi-Arid Nebraska. Alexandre T. Rosa*1, Cody F. Creech2, Roger Elmore1, Daran Rudnick1, John Lindquist1, Chuck Burr3, Strahinja Stepanovic4, Rodrigo Werle5; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Nebraska-Lincoln, Scottsbluff, NE, 3University of Nebraska-Lincoln, North Platte, NE, 4University of Nebraska-Lincoln, Grant, NE, 5University of Wisconsin-Madison, Madison, WV26
Benzobicyclon Utility for Weedy Rice Control. Mason C. Castner*, Jason K. Norsworthy, Chad Brabham, Fidel Gonzalez Torralva; University of Arkansas, Fayetteville, AR27
Control of Johnsongrass (Sorghum halepense) and Foxtails with Post-emergence Herbicides in Yellow and White Popcorn Hybrids. Samantha D. Isaacson*, Amit J. Jhala, John Lindquist; University of Nebraska-Lincoln, Lincoln, NE28
Weed Management and Crop Response Utilizing Isoxaflutole in HPPD Tolerant Cotton. Delaney C. Foster*1, Peter A. Dotray2, Corey Thompson3, Greg Baldwin4, Frederick Moore5; 1Texas Tech University, Lubbock, TX, 2Texas Tech University and Texas A&M AgriLife Research and Extension Service, Lubbock, TX, 3BASF, Abernathy, TX, 4BASF, Research Triangle Park, NC, 5BASF, Lubbock, TX29
Effect of Winter Wheat Cover Crop Termination Time on Dry Bean Production. Tyler C. Hicks*1, Andrew R. Kniss2, David A. Claypool2; 1University of Wyoming, Fort Collins, CO, 2University of Wyoming, Laramie, WY30
Sphere of Influence of Palmer Amaranth (Amaranthus palmeri) in Cotton (Gossypium hirsutum). Nicholas T. Basinger*1, David Weisberger1, Logan M. Dyer1, Ramon G. Leon2; 1University of Georgia, Athens, GA, 2North Carolina State University, Raleigh, NC31
Using Pesticides Wisely - Georgia 2019. A Stanley Culpepper*1, Jenna C. Vance1, Thomas Gray2, Laura P. Johnson3, Eric P. Prostko1; 1University of Georgia, Tifton, GA, 2Georgia Department of Agriculture, Atlanta, GA, 3University of Georgia, Athens, GA32
Sugarcane (Saccharum spp. Hybrids) Yield Component Response to Divine Nightshade (Solanum nigrescens) Establishment and Removal Timing. Douglas J. Spaunhorst*; USDA-ARS, Houma, LA33
Control of Canada Fleabane in Winter Wheat with Postemergence Herbicides. Nader Soltani*, Peter H. Sikkema; University of Guelph, Ridgetown, ON, Canada34
Glyphosate in Organic Grain: Exploring Potential Sources of Contamination Through Seed Analysis. Lilianna M. Bento*1, Barbara Keith1, Bruce Maxwell1, Jona Verreth2, William Dyer1; 1Montana State University, Bozeman, MT, 2Montana Agriculture Experiment Station Analytical Laboratory, Bozeman, MT35
Effective Dicamba Exposure on Enlist Soybean. Julie Reeves*, Sandy Steckel, Clay M. Perkins, Lawrence E. Steckel; University of Tennessee, Jackson, TN36
Effect of Herbicides Applied at First Visible Female Inflorescence on Palmer Amaranth (Amaranthus palmeri) Fecundity and Seed Viability. Eric B. Scruggs*, Michael L. Flessner; Virginia Tech, Blacksburg, VA37
Soybean Response to Multiple Dicamba Exposure. Todd A. Baughman*1, Robbie Peterson1, Misha R. Manuchehri2; 1Oklahoma State University, Ardmore, OK, 2Oklahoma State University, Stillwater, OK38
Volunteer Cotton Response to POST Herbicide Applications. Robbie Peterson*, Todd A. Baughman; Oklahoma State University, Ardmore, OK39
Expanding the Vision of Perennial Agriculture with IR-4 Registration in Kernza. Clair L. Keene*1, Eugene P. Law2, Jacob Jungers3, Don Wyse3, Valentin Picasso4, David E. Stoltenberg4; 1North Dakota State University Extension, Williston, ND, 2Cornell University, Ithaca, NY, 3University of Minnesota, Saint Paul, MN, 4University of Wisconsin-Madison, Madison, WV40
Evaluation of PRE and POST Applications of Metribuzin on Weed Control Programs in Corn (Zea mays). Taghi Bararpour*, Ralph R. Hale, M. W. Ebelhar; Mississippi State University, Stoneville, MS41
Burndown Residual Herbicide Plus Halauxifen-methyl (Elevore) for Early Preplant Horseweed (Conyza canadensis) Control. Taghi Bararpour*1, Ralph R. Hale1, Larry C. Walton2, Henry M. Edwards1; 1Mississippi State University, Stoneville, MS, 2Corteva, Tupelo, MS42
Does Late Season Weed Cover Reduce Corn Silage Yield and Alfalfa Establishment in Interseeded Corn/alfalfa Systems? Jose Luiz Carvalho de Souza Dias*, Mark J. Renz; University of Wisconsin-Madison, Madison, WV43
Field Bindweed (Convolvulus arvensis) Management in California Cotton. Kurt J. Hembree*; University of California Cooperative Extension, Fresno, CA44
Cereal Rye Termination Timing and Method Influence Glyphosate-Resistant Horseweed (Erigeron Canadensis) Suppression in Sugarbeet. Brian J. Stiles II*, Christy Sprague; Michigan State University, East Lansing, MI45
Roughstalk Bluegrass (Poa trivialis) Control in Winter Wheat. Gary Edward Powell*, Brian J. Stiles II, Christy Sprague; Michigan State University, East Lansing, MI46
Comparison of Herbicide Programs in Conventional, Glufosinate, and Glyphosate/Dicamba-Resistant Soybeans Across Nebraska. Adam Striegel*1, Stevan Knezevic2, Nevin Lawrence3, Gary Hein1, Greg R. Kruger4, Chris Proctor1, Kent Eskridge1, Amit J. Jhala1; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Nebraska-Lincoln, Concord, NE, 3University of Nebraska-Lincoln, Scottsbluff, NE, 4University of Nebraska-Lincoln, North Platte, NE47
Herbicide Resistant Italian Ryegrass (Lolium perenne Ssp. multiflorum) Survey in Northern Idaho and Eastern Washington. Traci Rauch*, Joan M. Campbell; University of Idaho, Moscow, ID48
Glyphosate-Tolerant Soybean Yield Loss and Yield Response to Micro-Rates of 2,4-D as Influenced by Growth Stage. Ivan B. Cuvaca*1, Stevan Knezevic2, Jon Scott1, Darko Jovanovic1; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Nebraska-Lincoln, Concord, NE49
Effect of Growth Stage on Glyphosate-Tolerant Soybean Sensitivity to Micro-rates of 2,4-D. Ivan B. Cuvaca*1, Jon Scott1, Darko Jovanovic1, Stevan Knezevic2; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Nebraska-Lincoln, Concord, NE50
Effects of Dicamba Ultra Micro-Rates on Soybean Yield - Hormesis or Not? Stevan Knezevic*; University of Nebraska-Lincoln, Concord, NE51
Growth and Sensitivity of Dicamba-Tolerant Soybean to Micro-Rates of 2,4-D. Stevan Knezevic*1, Jon Scott2, Darko Jovanovic2, Ivan B. Cuvaca2; 1University of Nebraska-Lincoln, Concord, NE, 2University of Nebraska-Lincoln, Lincoln, NE52
Weed Management Systems in Imidazolinone Tolerant Grain Sorghum in South Texas. Alvaro Garcia*1, Joshu A. McGinty2, Jamie Foster3, Greta Schuster1, Alinna Umphres1, Paul A. Baumann4; 1Texas A&M University, Kingsville, TX, 2Texas A&M AgriLife Extension, Corpus Christi, TX, 3Texas A&M AgriLife Research, Corpus Christi, TX, 4Texas A&M AgriLife Extension, College Station, TX53
Herbicidal Activity of a New Pyridine Derivative M-862 on Broadleaf Weeds and Wheat. Nam-Gyu Cho*1, Dae-Won Koo1, Ki-Hwan Hwang1, Suk-Jin Koo2; 1Moghu Research Center, Ltd., Yuseong, Daejeon, South Korea, 2Moghu Research Center, Ltd., Daejeon, South Korea54
Rapid Spread of Glyphosate-resistant Kochia [Bassia scoparia (L.) A.J.Scott] in Manitoba. Charles M. Geddes*1, Teandra Ostendorf1, Robert Gulden2, Tammy Jones3, Julia Leeson4, Scott Shirriff4, Shaun Sharpe4, Hugh J. Beckie5; 1Agriculture and Agri-Food Canada, Lethbridge, AB, Canada, 2University of Manitoba, Winnipeg, Canada, 3Manitoba Agriculture, Carman, MB, Canada, 4Agriculture and Agri-Food Canada, Saskatoon, SK, Canada, 5University of Western Australia, Crawley, Australia55
Characterization of Dicamba- and Fluroxypyr-resistant Kochia [Bassia scoparia (L.) A.J.Scott] in Alberta. Charles M. Geddes*1, Mallory Owen1, Elise Martin2, Linda Hall2, Scott Shirriff3, Julia Leeson3, Hugh J. Beckie4; 1Agriculture and Agri-Food Canada, Lethbridge, AB, Canada, 2University of Alberta, Edmonton, AB, Canada, 3Agriculture and Agri-Food Canada, Saskatoon, SK, Canada, 4University of Western Australia, Crawley, Australia56
A Survey of Florida Panhandle Row Crop Producers on Weeds Problem and Management Practices. Pratap Devkota*1, Ethan T. Carter2, Rhoda T. Broughton3; 1University of Florida, Jay, FL, 2University of Florida, Marianna, FL, 3University of Florida, Live Oak, FL57
Guayule (Parthenium argentatum) Seedling Response to Carfentrazone-ethyl. Bryan C. Pastor*1, Guangyauo Sam Wang2, William B. McCloskey1; 1University of Arizona, Tucson, AZ, 2Bridgestone Americas, Inc, Eloy, AZ58
Response of Common Louisiana Aquatic Weeds to Rice Herbicides. Benjamin M. McKnight*, Eric Webster, Samer Y. Rustom, Connor Webster, Bradley Greer, David C. Walker; Louisiana State University, Baton Rouge, LA59
InzenTM Sorghum Weed Control Programs with ZestTM WDG Herbicide. David Saunders*1, Joe Armstrong2, Michael Lovelace3, Jeffrey Krumm4; 1Corteva Agriscience, Dallas Center, IA, 2Corteva Agriscience, Indianapolis, IN, 3Corteva Agriscience, Lubbock, TX, 4Corteva Agriscience, Hastings, NE60
Resicore® for PRE and POST Weed Control in Corn. David Saunders*1, Joe Armstrong2, Kevin Johnson3; 1Corteva Agriscience, Dallas Center, IA, 2Corteva Agriscience, Indianapolis, IN, 3Corteva Agriscience, Lafayette, IN61
Desert Cotton Responses to Low Doses of 2,4-D or Dicamba. William B. McCloskey*1, Randy Norton2, Bryan C. Pastor1; 1University of Arizona, Tucson, AZ, 2University of Arizona, Safford, AZ62
Field-scale Assessment of Dicamba Off-target Movement from Soybeans in Missouri.. Reid Smeda*; University of Missouri, Columbia, MO63
Impact of Cereal Rye Cover Crop Termination Timing on the Fate of Soil-applied Residual Herbicides in Wisconsin Corn-soybean Production Systems. Nicholas J. Arneson*, Kolby R. Grint, Nikola Arsenijevic, Rodrigo Werle; University of Wisconsin-Madison, Madison, WV64
Comparison of Layered Herbicide Residual Programs for Waterhemp Control in Wisconsin Soybean Production. Nicholas J. Arneson*, Ryan P. DeWerff, Daniel H. Smith, Rodrigo Werle; University of Wisconsin-Madison, Madison, WV65
Potential for Gibberellic Acid as a Weed Seedbank Management Tool in Eastern Washington Dryland Systems. Rachel J. Zuger*, Amber L. Hauvermale, Ian Burke; Washington State University, Pullman, WA66
Impact of Cover Crop Mixtures and Climate Conditions on Weed Communities. Mary E. DuPre1, Maryse Bourgault2, Darin Boss2, Chris Larson1, Fabian D. Menalled1, Tim Seipel*1; 1Montana State University, Bozeman, MT, 2Montana State University -Northern Ag Research Center, Havre, MT67
Potential Yield Loss from Uncontrolled Weeds in Rice in North America. Sandeep S. Rana*1, Wesley Everman2, Anita Dille3, Peter H. Sikkema4, Michael L. Flessner5, Ian Burke6, Mark VanGessel7; 1Bayer Crop Science, Galena, MD, 2North Carolina State University, Raleigh, NC, 3Kansas State University, Manhattan, KS, 4University of Guelph, Ridgetown, ON, Canada, 5Virginia Tech, Blacksburg, VA, 6Washington State University, Pullman, WA, 7University of Delaware, Georgetown, DE68
Potential Yield Loss from Uncontrolled Weeds in Cotton in North America. Sandeep S. Rana*1, Wesley Everman2, Anita Dille3, Peter H. Sikkema4, Michael L. Flessner5, Ian Burke6, Mark VanGessel7; 1Bayer Crop Science, Galena, MD, 2North Carolina State University, Raleigh, NC, 3Kansas State University, Manhattan, KS, 4University of Guelph, Ridgetown, ON, Canada, 5Virginia Tech, Blacksburg, VA, 6Washington State University, Pullman, WA, 7University of Delaware, Georgetown, DE69
Evaluation of Weed Control Programs in Furrow Irrigated Rice (Oryza sativa). Leah M. Collie*1, Tom Barber1, Thomas R. Butts1, Ryan C. Doherty2, Zachary T. Hill3, Aaron Ross4; 1University of Arkansas System Division of Agriculture, Lonoke, AR, 2University of Arkansas Division of Agriculture Research & Extension, Monticello, AR, 3University of Arkansas Cooperative Extension Service, Monticello, AR, 4University of Arkansas, Lonoke, AR70
Cotton and Soybean Response to Selected Drift Rates of Imazapyr and Metsulfuron. Michael W. Marshall*; Clemson University Edisto Research & Education Center, Blackville, SC71
Large-Scale Evaluation of 2,4-D Off-Target Movement in Wisconsin Soybeans. Rodrigo Werle*, Nicholas J. Arneson, Maxwel Coura Oliveira, Ryan P. DeWerff; University of Wisconsin-Madison, Madison, WV72
Aerial Imagery as a Potential Tool to Evaluate Dicamba Off-Target Movement in Soybeans. Rodrigo Werle*1, Randy Pearson2, Josh Pristolas2, Maxwel Coura Oliveira1, Ryan Rector3; 1University of Wisconsin-Madison, Madison, WV, 2Southern Illinois University Edwardsville, Edwardsville, IL, 3Bayer Crop Science, St Louis, MO73
Weedy Rice (Oryza sativa f. spontaneae) Emergence and Growth Under Variable Irrigation Practices. Whitney Brim-DeForest*1, Luis Espino2; 1University of California Division of Agriculture and Natural Resources, Yuba City, CA, 2University of California Division of Agriculture and Natural Resources, Oroville, CA74
Evaluation of Benzobicyclon and ALS-inhibiting Herbicide Combinations for Control of Northern Jointvetch (Aeschynomene virginica) and Hemp Sesbania (Sesbania herbacea) in Drill Seeded Rice (Oryza sativa). Nathan Pearrow*1, Craigs Sandoski2, Brad M. Davis3, Thomas R. Butts3; 1University of Arkansas, Newport, AR, 2Gowan, Collierville, TN, 3University of Arkansas System Division of Agriculture, Lonoke, AR75
A Multi-State Screen of Field Populations of Horseweed (Conyza canadensis) to Applications of Dicamba and Glufosinate. Nicholas R. Steppig*1, Julie M. Young2, Kevin W. Bradley3, Jason K. Norsworthy4, Karla L. Gage5, Aaron Hager6, Greg R. Kruger7, Mark Loux8, Larry Steckel9, Bryan G. Young2; 1Purdue University, Lafayette, IN, 2Purdue University, Brookston, IN, 3University of Missouri, Columbia, MO, 4University of Arkansas, Fayetteville, AR, 5Southern Illinois University Carbondale, Carbondale, IL, 6University of Illinois, Urbana, IL, 7University of Nebraska-Lincoln, North Platte, NE, 8Ohio State University, Columbus, OH, 9University of Tennessee, Jackson, TN76
How to Avoid Glyphosate Injury in Glyphosate-Resistant Alfalfa. Earl Creech*1, Chet Loveland1, Matt Yost1, Corey V. Ransom1, Dan Putnam2; 1Utah State University, Logan, UT, 2University of California, Davis, Davis, CA77
Control of Palmer Amaranth (Amaranthus palmeri) with Glufosinate and S-metolachlor in Cotton Production Systems. William J. Rutland*1, Darrin M. Dodds2, Jacob P. McNeal2, John J. Williams2, Bradley J. Norris2, Steven D. Hall1; 1Mississippi State University, Starkville, MS, 2Mississippi State University, Mississippi State, MS78
The Effect of Multiple Exposure of Auxin Herbicide on Soybeans. Beau J. Varner*1, Kevin W. Bradley2, Aaron Hager3, Karla L. Gage4, Daniel B. Reynolds1, Jason K. Norsworthy5, Larry Steckel6, Bryan G. Young7; 1Mississippi State University, Mississippi State, MS, 2University of Missouri, Columbia, MO, 3University of Illinois, Urbana, IL, 4Southern Illinois University Carbondale, Carbondale, IL, 5University of Arkansas, Fayetteville, AR, 6University of Tennessee, Jackson, TN, 7Purdue University, Brookston, IN79
Low Tunnel Evaluation of Dicamba Premixes. Graham Oakley*1, A Stanley Culpepper2, Daniel B. Reynolds1, Reid Smeda3, Christy Sprague4, Rodrigo Werle5; 1Mississippi State University, Mississippi State, MS, 2University of Georgia, Tifton, GA, 3University of Missouri, Columbia, MO, 4Michigan State University, East Lansing, MI, 5University of Wisconsin-Madison, Madison, WV80
Impact of Dicamba+Various Postemergence Herbicide Tank-Mixes on Palmer Amaranth (Amaranthus palmeri) Control and Cotton Injury. Bradley J. Norris*1, Darrin M. Dodds1, Jacob P. McNeal1, John J. Williams1, Steven D. Hall2, William J. Rutland2; 1Mississippi State University, Mississippi State, MS, 2Mississippi State University, Starkville, MS81
Evaluation of Echinochloa crus-galli Sensitivity to Florpyrauxifen-benzyl. Grant L. Priess*, Chad Brabham, Jason K. Norsworthy; University of Arkansas, Fayetteville, AR82
Determining Duration of Residual Control of Soil-applied Herbicides in Cotton. Justin S. Calhoun*1, J Connor Ferguson2, Kayla L. Broster2, Zachary R. Treadway2, Luke H. Merritt2, Michael T. Wesley Jr.2; 1Mississippi State University, Starkville, MS, 2Mississippi State University, Mississippi State, MS83
Palmer Amaranth (Amaranthus palmeri) and Tarnished Plant Bug (Lygus lineolaris) Control with Various Dicamba + Insecticide Tank-Mixes in Cotton. Angus L. Catchot*1, Darrin M. Dodds2, Jacob P. McNeal2, John J. Williams2, Bradley J. Norris2, Steven D. Hall1, William J. Rutland1; 1Mississippi State University, Starkville, MS, 2Mississippi State University, Mississippi State, MS84
Effect of Late-Season Applied Herbicide Tank-Mixtures on Control and Seed Production of Palmer Amaranth in Postharvest Wheat Stubble. Rui Liu*, Vipan Kumar, Natalie Aquilina, Taylor Lambert; Kansas State University, Hays, KS85
Weed Species Identification Using Multispectral Imagery. Wesley Everman*, John Sanders; North Carolina State University, Raleigh, NC86
Implications of Multi-Tactic Weed Management Strategies to Deplete Glyphosate-Resistant Tall Waterhemp Seed Bank in Corn-Soybean Rotations in the Midwest. Ramawatar Yadav*, Prashant Jha, Damian D. Franzenburg, James M. Lee, Iththiphonh A. Macvilay; Iowa State University, Ames, IA87
History and Current Status of Herbicide-Resistant Waterhemp [Amaranthus tuberculatus (Moq.) J. D. Sauer] in Iowa Corn and Soybean Fields. . Prashant Jha*, Ryan C. Hamberg, Iththiphonh A. Macvilay, James M. Lee, Ramawatar Yadav, Avery J. Bennett, Edward S. Dearden, Damian D. Franzenburg; Iowa State University, Ames, IA88
Benefit of Dicamba in Early Postemergence Herbicide Tank-mixtures. Brent S. Heaton*, Mark L. Bernards; Western Illinois University, Macomb, IL89

POSTER - 02. HORTICULTURAL CROPS

Seed Treatments for Safening Herbicides in Vegetables. Matthew A. Cutulle1, Giovanni A. Caputo*2; 1Clemson University, Charleston, SC, 2Clemson University, Clemson, SC90
Evaluation of Growing Degree Day Based Chemigation Treatments for Management of Branched Broomrape in California Processing Tomato Systems. Matthew J. Fatino*1, Mohsen B. Mesgaran1, Brad Hanson2; 1University of California, Davis, Davis, CA, 2University of California, Davis, Winters, CA91
Effect of Repeated Mechanical Tuber Removal During the Fallow Period on Nutsedge (Cyperus spp.) Management in Bell Pepper. Ranjeet S. Randhawa*, Peter J. Dittmar; University of Florida, Gainesville, FL92
Preliminary Preemergence Herbicide Tolerance Screen for Transplanted Industrial Hemp. Michael L. Flessner*, Kevin W. Bamber, John H. Fike; Virginia Tech, Blacksburg, VA93
Reduced Rates of 2,4-D and Dicamba on Sweetpotato Propagation Beds. Thomas Batts*1, Stephen C. Smith2, Levi D. Moore2, Kira C. Sims3, Matthew Waldschmidt2, Sushila Chaudhari2, Katherine M. Jennings2; 1NC Cooperative Extension, Wilson, NC, 2North Carolina State University, Raleigh, NC, 3North Carolina State University, Goldsboro, NC94
Protecting Specialty Crops from Pests – How the Western Region IR-4 Project Helps Meet Farmer Pest Control Needs. Michael J. Horak*1, Stephen Flanagan2, Mika Tolson1; 1Western Region IR-4 Project, University of California, Davis, Davis, CA, 2Western Region IR-4 Project, University of California, Davis, Eugene, OR95
Suppression of Hazelnut (Corylus avellana) Suckers with 1-Naphthylacetic Acid. Arnaldo Marques Caldera da Silva1, David R. King*2, Richard K. Zollinger3, Marcelo L. Moretti2; 1University of São Paulo, Piracicaba, Brazil, 2Oregon State University, Corvallis, OR, 3Amvac Chemical Company, Spokane, WA96
Evaluation of Herbicide Programs in Dormant Stevia (Stevia rebaudiana) in North Carolina. Robert M. Welker*1, Roger B. Batts2; 1North Carolina State University, Raleigh, NC, 2NCSU IR-4 Field Research Center, Fremont, NC97
Crabgrass Control with Tembotrione, Topramezone, and Tolpyralate in Sweet Corn. Ed Peachey*; Oregon State University, Corvallis, OR98
Yield Loss Estimates for Vegetables in the USA and Canada. Mark VanGessel*1, Nicholas T. Basinger2, Ian Burke3, Anita Dille4, Wesley Everman5, Michael L. Flessner6, Zahoor A. Ganie7, Sandeep S. Rana8, Scott Senseman9, Peter H. Sikkema10, Nader Soltani10; 1University of Delaware, Georgetown, DE, 2University of Georgia, Athens, GA, 3Washington State University, Pullman, WA, 4Kansas State University, Manhattan, KS, 5North Carolina State University, Raleigh, NC, 6Virginia Tech, Blacksburg, VA, 7FMC, Newark, DE, 8Bayer Crop Science, Galena, MD, 9The University of Tennessee, Knoxville, TN, 10University of Guelph, Ridgetown, ON, Canada99
IR-4 Project Update and Program Changes. Daniel Kunkel*1, Roger B. Batts2, Jerry Baron3, Michael J. Braverman4; 1IR-4 Project, Rutgers University, Princeton, NJ, 2NCSU IR-4 Field Research Center, Fremont, NC, 3Affiliation Not Specified, Hillsborough, NJ, 4Rutgers University, Princeton, NJ100
Influence of Hemp Variety and Weed Free Period on Yield in Coastal South Carolina. Harrison T. Campbell*, Matthew A. Cutulle; Clemson University, Charleston, SC101
Can a Sunn Hemp (Crotalaria juncea) Living Mulch Reduce Herbicide Usage in Sweet Corn? Robert E. Nurse*1, Jichul Bae2, Kerry Bosveld1, Marie-Josee Simard3; 1Agriculture and Agri-Food Canada, Harrow, ON, Canada, 2Agriculture and Agri-Food Canada, Agassiz, BC, Canada, 3Agriculture and Agri-Food Canada, Saint-jean-sur-richelieu, Canada102
Update on Herbicide Resistance Genetic Testing. Kristen A. Obeid1, Marie-Josee Simard2, Martin Laforest3, Robert E. Nurse*1, Eric R. Page1, David Miville4; 1Agriculture and Agri-Food Canada, Harrow, ON, Canada, 2Agriculture and Agri-Food Canada, Saint-jean-sur-richelieu, Canada, 3AAC-AAFC, St-jean-sur-richelieu, QC, Canada, 4MAPAQ, Quebec City, QC, Canada103
Grape Response to Simulated Drift of Auxin Herbicides. Steven C. Haring*1, Junjun Ou2, Kassim Al-Khatib1, Brad Hanson3; 1University of California, Davis, Davis, CA, 2Corteva Agriscience, Indianapolis, IN, 3University of California, Davis, Winters, CA104
On-Farm Evaluation of POST-Directed Flumioxazin in New Mexico Chile Pepper. Brian J. Schutte*; New Mexico State University, Las Cruces, NM105
Have Greenhouse - Will Conduct Bioassays: A Grower Asked and We Rode to the Rescue. Pamela J.s. Hutchinson*, Celestina S. Miera, Brenda C. Kendall, Tenika Trevino, Brent R. Beutler; University of Idaho, Aberdeen, ID106

POSTER - 03. TURF AND ORNAMENTALS

Goosegrass (Elusine indica) Resistance to Mitotic Inhibiting Herbicides in Cool-Season Turfgrass. Katherine H. Diehl*1, Matthew T. Elmore1, James Brosnan2, Sarah Boggess2, Robert N. Trigiano2; 1Rutgers University, New Brunswick, NJ, 2University of Tennessee, Knoxville, TN107
Growth Response of Southern Landscape Ornamentals to Low Rates of 2,4-D, Dicamba, and Glyphosate Particle Drift. Ryan D. Langemeier*, Steve Li, Katilyn J. Price, Frances B. Browne; Auburn University, Auburn, AL108
Herbicide Phytotoxicity Influenced by Shade Timing and Density. Cameron Stephens*, Daniel Freund, James Kerns, Travis Gannon; North Carolina State University, Raleigh, NC109
Multi-State Research Evaluating Seedling Emergence and Herbicide Resistance Epidemic in Annual Bluegrass (Poa annua L.) in Managed Turfgrass Systems. Andrew W. Osburn*, Muthukumar V. Bagavathiannan, Becky Grubbs; Texas A&M University, College Station, TX110
How Can Weed Steamers Fit into a Landscape Weed Management Program? Cheryl Wilen1, Guy G. Hernanadez*2; 1University of California Division of Agriculture and Natural Resources, San Diego, CA, 2University of California Division of Agriculture and Natural Resources, Lake Forest, CA111
Using Drone-collected Imagery to Map Invasive Pampasgrass (Cortaderia selloana) Across a Golf Course. Maggie Reiter*; University of California Cooperative Extension, Fresno, CA112
Efficacy of Organic Herbicides and Other Alternatives to Glyphosate in Urban Landscapes. Maggie Reiter*1, Karey Windbiel-Rojas2, John A. Roncoroni3; 1University of California Cooperative Extension, Fresno, CA, 2University of California Statewide IPM Program, Davis, CA, 3University of California Division of Agriculture and Natural Resources, Napa, CA113
A Survey of Herbicide Resistance Issues in Nursery Crops, Christmas Trees and Landscape Plantings. Joe C. Neal*1, Jeffrey Derr2; 1North Carolina State University, Raleigh, NC, 2Virginia Tech, Virginia Beach, VA114
Weed Control in Container-grown Tree Seedlings Using Mulches and Pre-emerge Herbicides. Anthony L. Witcher*1, Eugene K. Blythe2; 1Tennessee State University, Mcminnville, TN, 2Auburn University, Auburn, AL115
Herbicide Longevity in Nursery Container Substrates. James Altland*; USDA-ARS, Wooster, OH116
The Safety of Conifers to Select Pyridine Herbicides. Mark A. Czarnota*; University of Georgia, Williamson, GA117
Post-Emergence Goosegrass (Eleusine indica) Control with SpeedZone and SpeedZone + Topramezone Mixtures. Daniel P. Tuck*, Matthew T. Elmore; Rutgers University, New Brunswick, NJ118
Zoysiagrass Response to Nonselective Herbicides is More Dependent on Heat Units Than Geography. Whitnee Askew*, Jordan M. Craft, Mike Goatley, Shawn Askew; Virginia Tech, Blacksburg, VA119
Effect of Submersion Time on Germination of Four Weed Species. Alisha Shiffer*1, Anthony V. LeBude2, Joe C. Neal1, James Altland3; 1North Carolina State University, Raleigh, NC, 2North Carolina State University, Mills River, NC, 3USDA-ARS, Wooster, OH120

POSTER - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

Addressing Challenges of African Mustard (Brassica tournefortii) Management in Utah. Natalie L. Fronk*1, Corey V. Ransom1, Benjamin Scow2, Chad Reid3; 1Utah State University, Logan, UT, 2Utah State University Extension, Hurricane, UT, 3Utah State University Extension, Cedar City, UT121
Using Unmanned Aerial Systems for Estimating Biomass of Smutgrass (Sporobolus indicus) and Management Interventions. Zachary S. Howard*1, Bishwa B. Sapkota1, Chenghai Yang2, Muthukumar V. Bagavathiannan1, Scott A. Nolte3; 1Texas A&M University, College Station, TX, 2USDA-ARS, College Station, TX, 3Texas A&M AgriLife Extension, College Station, TX122
Ventenata (Ventenata dubia) Control and Plant Community Response to Herbicide Treatments. Hailey L. Buell*, Corey V. Ransom, Steve Young; Utah State University, Logan, UT123
Tolerance of Native Perennial Grasses to Esplanade on Conservation Reserve Program Land. Jared A. Beuschlein*1, Rachel J. Zuger1, Harold Quicke2, Ian Burke1; 1Washington State University, Pullman, WA, 2Bayer, Windsor, CO124
Evaluating Historical Treatments to Clarify Optimal Herbicide Treatment Sequences for Invasive Old World Climbing Fern (Lygodium microphyllum) on Tree Islands of the Florida Everglades. Jonathan Glueckert*1, Stephen F. Enloe2; 1University of Florida, Boynton Beach, FL, 2University of Florida, Gainesville, FL125
Phragmites australis In Colorado: Haplotype Distribution and Molecular Tools for Management Decisions. Neeta Soni*1, Eric L. Patterson2, Luke Tembrock1, Todd A. Gaines1; 1Colorado State University, Fort Collins, CO, 2Michigan State University, East Lansing, MI126
Woody Debris Piles Facilitate Increased Douglas-fir Survival at a Scotch Broom (Cytisus scoparius) Infested Site. James Dollins*, Timothy B. Harrington; USDA FOREST SERVICE - PNW RESEARCH STATION, Olympia, WA127
Johnsongrass Management on Roadsides: Control, Suppression, or Selectivity? Joe Omielan*; University of Kentucky, Lexington, KY128
Response of Seeded Species to Three Common Herbicides Used for Downy Brome (Bromus tectorum) Control. Melissa L. Landeen1, Kevin Gunnell2, Steve Young*3; 1Utah Division of Wildlife Resources, Ephraim, UT, 2Utah Division of Wildlife Resources, Fountain Green, UT, 3Utah State University, Logan, UT129
Pollinator Habitat Diversity and Quantity Increases with Long-Term Cheatgrass (Bromus tectorum) Control. James Sebastian*1, Steve Sauer1, Shannon Clark2, Derek J. Sebastian3; 1Boulder County Open Space, Longmont, CO, 2Colorado State University, Fort Collins, CO, 3Bayer, Greeley, CO130
Integrated Management of Some Forest Invasive Weeds in B.c. Forestry, Victoria, Canada. Raj Nil Prasad*; Emeritus scientist / prof, Victoria, BC, Canada131
Genetic Study and Chemical Control of Vaseygrass. Renata Thaysa da Silva Santos*1, Esteban Fernando Rios2, Pedro Luis da Costa Aguiar Alves1; 1São Paulo State University, Jaboticabal, Brazil, 2University of Florida, Gainesville, FL132
Dose-response Curves and Herbicides Efficacy of Pos-emergence Applications in Paspalum virgatum . Renata Thaysa da Silva Santos*, Aline Brufato, Pedro Luis da Costa Aguiar Alves; São Paulo State University, Jaboticabal, Brazil133
Management Considerations for Milkweed (Asclepias viridis) Habitat in the Southeast. David Russell*1, John D. Byrd, Jr.2, Nolan H. Thorne3, Maria Leticia M. Zaccaro4, Hayden Quick2; 1Auburn University, Madison, AL, 2Mississippi State University, Mississippi State, MS, 3Mississippi State University, Mississippi State University, MS, 4University of Arkansas, Fayetteville, AR134
Long-term Effects of Restoration Treatments in a Wyoming Big Sagebrush Community Invaded by Annual Exotic Grasses. Becky K. Kerns*1, Dana Ikeda1, Michelle A. Day2; 1US Forest Service - PNW Research Station, Corvallis, OR, 2US Forest Service - Rocky Mountain Research Station, Corvallis, OR135
Integrating Common Control Methods for Wild Parsnip (Pastinaca sativa) Near Roads with Imazapic + Metsulfuron for Grass Height Suppression. Leo Roth*, Mark J. Renz; University of Wisconsin-Madison, Madison, WV136

ORAL - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

The Effect of Common and Novel Pasture Herbicides on Forage Grass Establishment. Wykle C. Greene*, Michael L. Flessner; Virginia Tech, Blacksburg, VA137

POSTER - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

Cutleaf Vipergrass (Scorzonera laciniata) Discovery and Management in Utah. Cody J. Beckley*1, Jody A. Gale2, Corey V. Ransom1, Mark Nelson3; 1Utah State University, Logan, UT, 2Utah State University Extension, Richfield, UT, 3Utah State University Extension, Beaver, UT138

POSTER - 07. TEACHING AND EXTENSION/ TEACHING AND TECHNOLOGY TRANSFER

Can Trunk Paint Mitigate Herbicide Damage in Young Almond Trees? Drew A. Wolter*1, Danielle M. Lightle2, Brad Hanson3; 1University of California, Davis, Sacramento, CA, 2University of California Cooperative Extension, Oroville, CA, 3University of California, Davis, Winters, CA139
Simulation Modeling as Decision-Aid for Farmers: Adapting Weed Management to a Changing Climate. Ruth Sexton*, Eric Gallandt; University of Maine, Orono, ME140
Identifying Herbicide Injury in Potato. Andrew P. Robinson*; North Dakota State University / University of Minnesota, Fargo, ND141
Useful Wild Plants of Texas....A Resource for Weed Scientists That Need to Know More Than How to Kill Plants. John D. Byrd, Jr.*; Mississippi State University, Mississippi State, MS142
Update to the Herbicide Resistance Action Committee Classification on Mode of Action. Rex A. Liebl*1, Jeffrey Epp2, Bernd Laber3, Hubert Menne3, James Morris4, Matthias Witschel5; 1BASF Corp, Raleigh, NC, 2Corteva Agriscience, Indianapolis, IN, 3Bayer AG Crop Science, Frankfurt, Germany, 4Syngenta, Bracknell, United Kingdom, 5BASF SE, Ludwigshafen, Germany143
University of Tennessee Dicamba Stewardship Education Efforts. Larry Steckel, Ginger Rowsey*; University of Tennessee, Jackson, TN144
Montana Noxious Weed Survey: Has 25 Years of Education Been Effective? Shantell A. Frame-Martin*1, Jane Mangold2, Eric Raile2; 1Montana Noxious Weed Education Campaign, Bozeman, MT, 2Montana State University, Bozeman, MT145
Undergraduate Students Self-Assess Learning Gains. Karen A. Renner*; Michigan State University, East Lansing, MI146
Efforts in Weed Management Outreach for Urban &Amp; Community Audiences in California. Karey Windbiel-Rojas*1, Maggie Reiter2, John A. Roncoroni3; 1University of California Statewide IPM Program, Davis, CA, 2University of California Cooperative Extension, Fresno, CA, 3University of California Division of Agriculture and Natural Resources, Napa, CA147
The Weedy and Invasive Plant Species Community of the American Society of Agronomy: Activities and Opportunities. Anil Shrestha*1, Sharon Clay2; 1California State University, Fresno, Fresno, CA, 2South Dakota State University, Brookings, SD148
Unseen Flowers: Weed Macro Photography Update. Robert F. Norris*; University of California, Davis, Davis, CA149
National Pesticide Safety Education Center (NPSEC): Supporting Territory Pesticide Safety Education Programs (PSEPs). Kerry Richards*1, Carroll Moseley2; 1National Pesticide Safety Education Center, Port Matilda, PA, 2Syngenta, High Point, NC150

POSTER - 08. FORMULATION, ADJUVANT, & APPLICATION TECHNOLOGY

Efficacy and Economic Analysis of Light Activated Weed Seeking Spray Technology in Eastern Washington Fallow Systems. Lydia S. Fields*1, Rachel J. Zuger1, Derek Appel2, Ian Burke1; 1Washington State University, Pullman, WA, 2Washington State University, Davenport, WA151
Evaluating Spray Nozzles at Lower Heights and Pressures for Circular Application. Haosheng Lin*1, Joseph Neal2, Gary Roberson2, Sierra Young2, Ramon G. Leon2; 1North Carolina State University, Cary, NC, 2North Carolina State University, Raleigh, NC152
Soybean Response to Dicamba Tank Contamination, Particle Drift, and Vapor. Frances B. Browne*1, Steve Li1, Katilyn J. Price1, Ryan D. Langemeier1, Greg R. Kruger2; 1Auburn University, Auburn, AL, 2University of Nebraska-Lincoln, North Platte, NE153
A Novel Fluorescent Compound to Measure Herbicide Physical Drift. Vijay Nandula*; USDA-ARS, Stoneville, MS154
EnlistTM Herbicides with Colex-D Technology for On-Target Applications. David M. Simpson*; Corteva, Indianapolis, IN155
Introducing Four New Adjuvants from AgraSyst for Herbicide Use. Jim T. Daniel*1, Scott Parrish2; 1Daniel Ag Consulting, Keenesburg, CO, 2AGRASYST, Spokane, WA156
Herbicide Influence on Bradyrhizobia Growth. Joy Amajioyi1, Sharon Clay*2; 1South Dakota State University, Brookings, SD, 2SDSU, Brookings, SD157
Impact of Carrier Volume Rate on Efficacy of PRE-Emergence Herbicides in Wisconsin Cropping Systems. Ryan P. DeWerff*, Maxwel Coura Oliveira, Sarah V. Striegel, Rodrigo Werle; University of Wisconsin-Madison, Madison, WV158
The Utility of a Planter Mounted Pulse Width Modulation Spray System. Ryan P. DeWerff*, Nicholas J. Arneson, Rodrigo Werle; University of Wisconsin-Madison, Madison, WV159

POSTER - 09. WEED BIOLOGY AND ECOLOGY

Germination Response of Downy Brome, Wild Oat, and Italian Ryegrass to Gibberellic Acid in Palouse Silt Loam. Madisyn R. Beaudoin*, Rachel J. Zuger, Ian Burke; Washington State University, Pullman, WA160
Effects of Tillage and Pesticides on Weed Seedling Emergence Over a Growing Season. Samuel A. Palmer*1, Benjamin Fehr2, Richard G. Smith2; 1University of New Hampshire, Epsom, NH, 2University of New Hampshire, Durham, NH161
Using Biology to Better Inform Marestail (Conyza canadensis) Management. Ryan Collins*1, Erin Haramoto1, Karla L. Gage2, Brent Sunderlage2, Anita Dille3, Reid Smeda4; 1University of Kentucky, Lexington, KY, 2Southern Illinois University Carbondale, Carbondale, IL, 3Kansas State University, Manhattan, KS, 4University of Missouri, Columbia, MO162
Evaluating Evapotranspiration and Growth of Palmer Amaranth (Amaranthus palmeri) in a Corn/Soybean and Non-crop Situation Under Subsurface Drip and Center-pivot Irrigation Systems. Jasmine M. Mausbach*1, Suat Irmak1, John Lindquist1, Debalin Sarangi2, Amit J. Jhala1; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Wyoming, Powell, WY163
Genetics of Dioecy in Amaranthus tuberculatus and A. palmeri: an Update. Jacob S. Montgomery*, Darci A. Giacomini, Patrick Tranel; University of Illinois, Urbana, IL164
Confirmation of Glyphosate Resistance in a Johnsongrass (Sorghum halepense) Biotype from Missouri. Sarah E. Dixon*, Reid Smeda; University of Missouri, Columbia, MO165
Germination Patterns of California Weedy Rice (Oryza sativa f. spontaneae Rosh.) at Various Temperature and Water Potential Combinations Under Controlled Conditions. Liberty B. Galvin*, Mohsen B. Mesgaran, Kassim Al-Khatib; University of California, Davis, Davis, CA166
Determining the Origin of Glyphosate Resistant Amaranthus palmeri (Palmer Amaranth) in South America by Comparison of Extrachromosomal Circular DNA (eccDNA) EPSPS Replicon. Crystal D. Sparks*1, Todd A. Gaines1, Paul Neve2, Anita Kuepper3, Gancho Slavov2, Martin Vila-Aiub4, Alejandro Garcia5, Aldo Merotto6; 1Colorado State University, Fort Collins, CO, 2Rothamsted Research, Harpenden, United Kingdom, 3Bayer Cropscience, Frankfurt, Germany, 4University of Buenos Aires, Buenos Aires, Argentina, 5INIA Uruguay, Montevideo, Uruguay, 6University of Rio Grande do Sul, Porto Alegre, Brazil167
Population Structure of Russian-thistle (Salsola tragus L.) in the Inland Pacific Northwest. Ian Burke, Drew J. Lyon, John F. Spring, Samuel R. Revolinski*; Washington State University, Pullman, WA168
Interspecific Gene Flow Between Sorghum bicolor and S. halepense with and without Self-Pollen Competition. Cynthia Sias*, Blake L. Young, Daniel Hathcoat, George Hodnett, William Rooney, Muthukumar V. Bagavathiannan; Texas A&M University, College Station, TX169
Evolution of Resistance to HPPD-inhibiting Herbicides in a Wild Radish (Raphanus raphanistrum) Population Via Enhanced Herbicide Metabolism. Huan Lu*1, Qin Yu2, Heping Han2, Mechelle J. Owen2, Stephen B. Powles3; 1University of Western Australia, Crawley, Australia, 2University of Western Australia, Perth, Australia, 3University of Western Australia, Nedlands, Australia170
The European Project IWMPRAISE: Integrated Weed Management in Olive Orchards of Spain. Veronica Pedraza1, Irache Garnica2, Juan A. Lezaun2, Jose L. Gonzalez-Andujar*3; 1CSIC, Cordoba, Spain, 2INTIASA, Villaba, Spain, 3Instituto de Agricultura Sostenible (CSIC), Cordoba, Spain171
Identification of Goosegrass (Eleusine indica) Resistant to Dithiopyr and Dinitroaniline Herbicides. Joseph S. McElroy*1, John M. Peppers2, Nathan D. Hall1, Elijah C. Russell1, James Harris1, Jinesh D. Patel1; 1Auburn University, Auburn, AL, 2Virginia Tech, Blacksburg, VA172
Light Quality and Weed Seed Germination: What We Have Learnt and the Practical Application Potential. Albert T. Adjesiwor*, Andrew R. Kniss; University of Wyoming, Laramie, WY173
Risk Assessment and Tools for Monitoring Herbicide-Resistance Evolution in Weedy Sorghum.. John Lindquist*1, Melinda Yerka2, Brigitte Tenhumberg1, Amit J. Jhala1, Rodrigo Werle3; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Nevada - Reno, Reno, NV, 3University of Wisconsin-Madison, Madison, WV174
Multiple Resistance to ACCase, ALS and EPSPS Inhibiting Herbicides in the Genus Lolium. Jose G. Vázquez Garcia*1, Ricardo Alcántara-de la Cruz2, Candelario Palma-Bautista1, Hugo Enrique Cruz-Hipolito1, Joel Torra3, Antonia M. Rojano-Delgado1, Rafael De Prado1; 1University of Cordoba, Cordoba, Spain, 2Universidade Federal de São Carlos, São Carlos, Brazil, 3Universitat de Lleida, Lleida, Spain175
Multiple Herbicide Resistance in Parthenium hysterophorus from Central America. Candelario Palma Bautista*1, Jose G. Vázquez-García1, Hugo Enrique Cruz-Hipolito1, Guido Plaza2, Verónica Hoyos3, Joel Torra4, Antonia M. Rojano-Delgado1, Rafael De Prado1; 1University of Cordoba, Cordoba, Spain, 2Universidad Nacional de Colombia, Bogotá, Colombia, 3Universidad del Magdalena, Santa Marta, Colombia, 4Universitat de Lleida, Lleida, Spain176
Relationship Between Glyphosate Resistance and Root Fluorescence in Italian Ryegrass (Lolium perenne L. spp. multiflorum) Populations from Oregon. Andréia Kazumi Suzukawa*, Carol Mallory-Smith, Andrew G. Hulting, Caio A. Brunharo; Oregon State University, Corvallis, OR177
Chloris radiata Resistant to EPSPS and ALS Inhibitors from Colombia. Veronica Hoyos1, Guido Plaza2, Jose G. Vázquez García3, Candelario Palma-Bautista3, Antonia M. Rojano-Delgado3, Rafael De Prado*3; 1Universidad del Magdalena, Santa Marta, Colombia, 2Universidad Nacional de Colombia, Bogotá, Colombia, 3University of Cordoba, Cordoba, Spain178
Characterization of Bromus Species Using SSR Markers. José G. Vázquez García1, Patricia Castro2, Teresa Millan2, Rafael De Prado*2; 1University of Cordoba, Córdoba, Spain, 2University of Cordoba, Cordoba, Spain179
Using Canopy Hyperspectral Reflectance Data to Distinguish Six Pigweeds. Reginald S. Fletcher*; Affiliation Not Specified, Greenville, MS180
Management of Downy Brome (Bromus tectorum L.) in Fallow Systems with Indaziflam. Tara L. Burke*1, Derek Appel2, Rachel J. Zuger3, Ian Burke3; 1Washington State University, Albion, WA, 2Washington State University, Davenport, WA, 3Washington State University, Pullman, WA181
The International Weed Genomics Consortium: a Resource for Weed Genomics. Sarah Morran*1, Paul Neve2, Eric L. Patterson3, Scott McElroy4, Roland S. Beffa5, Todd A. Gaines1; 1Colorado State University, Fort Collins, CO, 2Rothamsted Research, Harpenden, United Kingdom, 3Michigan State University, East Lansing, MI, 4Auburn University, Auburn, AL, 5Bayer AG, CropScience Division, Frankfurt, Germany182
Genotyping Echinochloa for Species Identification and Resistance. Sarah Morran*, Todd A. Gaines; Colorado State University, Fort Collins, CO183
Characterization of F1 Hybrid Progenies Originating from Grain Sorghum (Sorghum bicolor) x Johnsongrass (S. halepense) Crosses. Nithya K. Subramanian*1, Cynthia Sias1, Usha Rani Pedireddi1, Sara Ohadi2, Daniel Hathcoat1, George Hodnett1, William Rooney1, Muthukumar V. Bagavathiannan1; 1Texas A&M University, College Station, TX, 2University of California, Davis, Davis, CA184
Understanding Gene Flow from Grain Sorghum (Sorghum bicolor) to Johnsongrass (S. halepense). Nithya K. Subramanian*, Daniel Lavy, Cynthia Sias, George Hodnett, William Rooney, Muthukumar V. Bagavathiannan; Texas A&M University, College Station, TX185
Predictive Habitat Modeling for Ventenata dubia (Ventenata). Stacey N. Robbins*, Lisa J. Rew, Nicholas Fox; Montana State University, Bozeman, MT186
Waterhemp (Amaranthus tuberculatus) Seed Production and Seed Viability Following Injury from Sublethal Dicamba Dose. Mark L. Bernards*, Faith Duke, Allyson M. Rumler, Alexis L. Meadows, Brent S. Heaton; Western Illinois University, Macomb, IL187

POSTER - 10. BIOCONTROL OF WEEDS

Evaluation of Biofumigants in California Strawberry Nurseries. Nelly Guerra*; University of California, Davis, Davis, CA188

POSTER - 11. PHYSIOLOGY

Recurrent Selection with Fenoxaprop Decrease Echinochloa crus-galli (Barnyardgrass) Control by Quinclorac. Carlos Alberto Gonsiorkiewicz Rigon*1, Luan Cutti2, Guilherme Menegol Turra2, Enrico Zilch Ferreira2, Todd A. Gaines1, Franck E. Dayan1, Aldo Merotto Jr2; 1Colorado State University, Fort Collins, CO, 2Federal University of Rio Grande do Sul, Porto Alegre, Brazil189
The Physiological Basis of Differential Resistance to PPO-Inhibiting Herbicides Used Pre- and Post-Emergent. Abigail Barker*, Franck E. Dayan; Colorado State University, Fort Collins, CO190
Altered Target Site-Based Resistance to Mesosulfuron, an ALS Inhibitor, in Italian Ryegrass from Mississippi. Vijay Nandula*1, Darci A. Giacomini2, Jason A. Bond3; 1USDA-ARS, Stoneville, MS, 2University of Illinois, Urbana, IL, 3Mississippi State University, Stoneville, MS191
Defining the Locoweed-Fungal Endophyte Complex: A Common Garden Study Comparing Locoweed Stress Responses with and without its Fungal Endophyte. Barbara Keith*1, Megan Hofland1, Sarah Ward2, David K. Weaver1, Tracy M. Sterling3; 1Montana State University, Bozeman, MT, 2Colorado State University, Fort Collins, CO, 3Affiliation Not Specified, Bozeman, MT192
Inhibitions of Goosegrass (Eleusine indica L. Gaertn.) and Soybean [Glycine max (L.) Merr.] Germination, Growth, and Development by Cover Crop Residues. Avat Shekoofa*1, Larry Steckel1, Clay M. Perkins1, Virginia Sykes2; 1University of Tennessee, Jackson, TN, 2University of Tennessee, Knoxville, TN193
Identification of Candidate Genes on Wheat Group 5 Chromosomes Associated with Halauxifen-Methyl Tolerance. Olivia A. Obenland, Brendan V. Jamison, Dean E. Riechers*; University of Illinois, Urbana, IL194
Root System Architecture and Genes Associated with Allelopathy in Weedy Rice. Brooklyn C. Schumaker1, Swati Shrestha2, Shandrea D. Stallworth2, Auriana P. Tucker2, Te-Ming (Paul) Tseng*2; 1Mississippi State University, Starkville, MS, 2Mississippi State University, Mississippi State, MS195
Herbicide Physiology Online: A Multi-Institutional Course Spanning a Decade. Tracy M. Sterling*1, William Dyer2, Sarah Ward3, Lynn Igegneri4, Erin E. Burns5, Fabian D. Menalled2, Deana Namuth-Covert6, Mithila Jugulam7; 1Affiliation Not Specified, Bozeman, MT, 2Montana State University, Bozeman, MT, 3Colorado State University, Fort Collins, CO, 4Oregon State University, Corvallis, OR, 5Michigan State University, East Lansing, MI, 6Ohio State University, Columbus, OH, 7Kansas State University, Manhattan, KS196
A Genetic Map for Amaranthus tuberculatus. Brent P. Murphy*, Darci A. Giacomini, Jacob S. Montgomery, Patrick Tranel; University of Illinois, Urbana, IL197
EPSPS Gene Copy Number of Glyphosate-Resistant Common Waterhemp Biotypes from Eastern Nebraska Counties. Rachana A. Jhala*1, Todd A. Gaines2, Crystal D. Sparks2, Stevan Knezevic3, Amit J. Jhala1; 1University of Nebraska-Lincoln, Lincoln, NE, 2Colorado State University, Fort Collins, CO, 3University of Nebraska-Lincoln, Concord, NE198

POSTER - 12. SOIL AND ENVIRONMENTAL ASPECTS

Seasonal Fluctuations of 2,4-D and Dicamba Concentrations in Bulk Deposition Samples Collected Throughout Missouri in 2019. Eric Oseland*1, Robert Lerch2, Mandy Bish1, Kevin W. Bradley1; 1University of Missouri, Columbia, MO, 2USDA-ARS, Columbia, MO199
Effects of Repeated Herbicide Applications on Soil Microbial Communities: an Analysis of Microbial Fitness. Katie Martin*1, Brad Hanson2; 1University of California, Davis, Davis, CA, 2University of California, Davis, Winters, CA200
Optimizing Chemical Analysis of Dicamba Residues from Polyurethane Foam (PUF) Samples. Shelby E. Lanz*, Tom Mueller; University of Tennessee, Knoxville, TN201
Role of Bonechar in Indaziflam Efficiency on Weed Control. Kassio F. Mendes*1, Ivan F. Furtado1, Kamila C. Mielke1, Alessandro C. Lima1, Larissa M. Mota1, Rodrigo N. Sousa2; 1Universidade Federal de Viçosa, Viçosa, Brazil, 2ESALQ/USP, Piracicaba, Brazil202
Transport of 14C-Mesotrione Through Soil Columns Under Different Physical-Chemical Properties. Rodrigo N. Sousa*1, Kassio F. Mendes2, Alessandro C. Lima2, Kamila C. Mielke2, Valdemar L. Tornisielo3; 1ESALQ/USP, Piracicaba, Brazil, 2Universidade Federal de Viçosa, Viçosa, Brazil, 3CENA/USP, Piracicaba, Brazil203

POSTER - 13. INTEGRATED WEED MANAGEMENT

Rapid Detection of Herbicide-resistant Annual Ryegrass (Lolium rigidum). Martina Badano Perez*, Danica Goggin, Roberto Busi, Hugh J. Beckie; University of Western Australia, Crawley, Australia204
Impacts of Winter Cover Crops on Weeds in Southwest Irrigated Agriculture. Prashasti Agarwal*, Erik A. Lehnhoff; New Mexico State University, Las Cruces, NM205
Winter Wheat Variety, Planting Date, and Herbicide Selection: Effects on Rescuegrass (Bromus catharticus) Management. Hannah C. Lindell*1, Misha R. Manuchehri1, Todd A. Baughman2, Emi Kimura3, Brett F. Carver1, Lane S. Newlin1, Justin T. Childers1; 1Oklahoma State University, Stillwater, OK, 2Oklahoma State University, Ardmore, OK, 3Texas A&M AgriLife, College Station, TX206
Ecological and Economic Implications of Integrated Palmer Amaranth (Amaranthus palmeri) Management Strategies in Cotton. Rodger B. Farr*1, Jason K. Norsworthy1, Tom Barber2, Grant L. Priess1, Mason C. Castner1; 1University of Arkansas, Fayetteville, AR, 2University of Arkansas System Division of Agriculture, Lonoke, AR207
Efficacy of Cotton and Peanut Residual Herbicides in High Residue Cover Crop System. Katilyn J. Price*, Steve Li, Frances B. Browne, Ryan D. Langemeier; Auburn University, Auburn, AL208
Impact of Harvest-time and Post-harvest Seedbank Management Tactics for Italian Ryegrass (Lolium multiflorum) in South-Central US Wheat Production. Aniruddha Maity*1, Blake L. Young1, Lauren M. Lazaro2, Nicholas Korres3, Jason K. Norsworthy4, Muthukumar V. Bagavathiannan1; 1Texas A&M University, College Station, TX, 2Louisiana State University AgCenter, Baton Rouge, LA, 3USDA-ARS, Urbana, IL, 4University of Arkansas, Fayetteville, AR209
Weed-Microbial Competition for Nitrogen in Soils Amended with Carbon: A New Soil Modification Tool for Weed Management? Maria A. Gannett*; Cornell University, Ithaca, NY210
The Search for Herbicidal Natural Products from the Plants of Hawai'i. Joey Ooka*, Sherry-Ann Hara, Daniel K. Owens; University of Hawaii, Manoa, Honolulu, HI211
Population Dynamics of Common Waterhemp (Amaranthus rudis) Under Short-term Versus Diversified Cropping Systems, a Matrix Modeling Approach. Matt Liebman, Huong Nguyen*; Iowa State University, Ames, IA212
Evaluation of PtxD-Phosphite as a Weed Control System in Cotton. Shilpa Singh*, Devendra Pandeya, Keerti Rathore, Muthukumar V. Bagavathiannan; Texas A&M University, College Station, TX213
First Report of Multiple Herbicide Resistance in Ragweed Parthenium (Parthenium hysterophorus L.) from Texas. Shilpa Singh*1, Vijay Singh2, Joshua A. McGinty3, Muthukumar V. Bagavathiannan1; 1Texas A&M University, College Station, TX, 2Virginia Tech, Painter, VA, 3Texas A&M AgriLife Extension Service, Corpus Christi, TX214
Effect of Four Summer Cover Crop Species and Planting Timing on Weed Suppression, Soil Moisture Dynamics, and Yield in Corn. Spencer L. Samuelson*, Muthukumar V. Bagavathiannan; Texas A&M University, College Station, TX215
Evaluation of Non-chemical Tactics for Managing Johnsongrass (Sorghum halepense). Spencer L. Samuelson*, Leonard Herndon, Muthukumar V. Bagavathiannan; Texas A&M University, College Station, TX216
Synthesizing Images for Semantic Segmentation of Weed Species in an Airborne RGB Imagery. Chengsong Hu*1, Bishwa B. Sapkota1, Steven B. Mirsky2, Muthukumar V. Bagavathiannan1; 1Texas A&M University, College Station, TX, 2USDA-ARS, Beltsville, MD217
Virtual Agriculture: Modeling 3D Structure and Phenological Developments of Crops and Weeds. Chengsong Hu*, Muthukumar V. Bagavathiannan; Texas A&M University, College Station, TX218
Dry Bean Responses to 2,4-D Ester Applied Preplant and Preemergence. Nader Soltani*, Peter H. Sikkema; University of Guelph, Ridgetown, ON, Canada219
Getting Rid of Weeds Through Integrated Weed Management. Claudio G. Rubione*1, Mark VanGessel1, Lauren M. Lazaro2, Michael L. Flessner3, Kara Pittman3, Muthukumar V. Bagavathiannan4, Lovreet S. Shergill5, Steven B. Mirsky6, Victoria Ackroyd7; 1University of Delaware, Georgetown, DE, 2Louisiana State University AgCenter, Baton Rouge, LA, 3Virginia Tech, Blacksburg, VA, 4Texas A&M University, College Station, TX, 5USDA-ARS & University of Delaware, Beltsville, MD, 6USDA-ARS, Beltsville, MD, 7USDA, Beltsville, MD220
Harvest Weed Seed Control in Wheat Production Systems of the PNW. Judit Barroso*1, Carolina San Martin Hernandez2, Jennifer A. Gourlie1, Stewart B. Wuest3, Mark Thorne4, Kyle Roerig5, Andrew G. Hulting5; 1Oregon State University, Adams, OR, 2Oregon State University, Pendleton, OR, 3USDA-ARS, Adams, OR, 4Washington State University, Pullman, WA, 5Oregon State University, Corvallis, OR221
Evaluation of Herbicides for Potential Use in an Integrated Release Method of Trichogramma ostriniae. Jeffrey D. Cluever1, Robert Wright2, Nevin Lawrence1, Jeff Bradshaw*1; 1University of Nebraska-Lincoln, Scottsbluff, NE, 2University of Nebraska-Lincoln, Lincoln, NE222
Control Alternatives in Carduus acanthoides Resistant to 2,4-D and Glyphosate. Candelario Palma-Bautista*1, Pablo Belluccini2, Valentin Gentiletti3, Jose G. Vazquez García1, Antonia M. Rojano-Delgado1, Rafael De Prado1; 1University of Cordoba, Cordoba, Spain, 2INTA Marcos Juarez, Cordoba, Argentina, 3ETS Ingenieros Agronomos, Camilo Aldao, Argentina223
Efficacy of Indazaflam on Downy Brome Control in Northern Nevada. Charlie D. Clements*; USDA-ARS, Reno, NV224
Total Weed and Nutsedge Populations in Fall Vs. Spring Planted Crops Following Different Cultivation Types and Frequency During the Fallow Period. Peter J. Dittmar*, Danielle D. Treadwell; University of Florida, Gainesville, FL225
Broadleaf Weed Population and Diversity Following Different Cultivation Types and Frequency Before Fall or Spring Vegetable Crops. Peter J. Dittmar*, Danielle D. Treadwell; University of Florida, Gainesville, FL226
Using Unmanned Aerial Systems for Early Prediction of Competitive Interactions Between Italian Ryegrass (Lolium perenne Ssp. multiflorum) and Wheat. Bishwa B. Sapkota*1, Vijay Singh2, Clark Neely3, Muthukumar V. Bagavathiannan1; 1Texas A&M university, College Station, TX, 2Virginia Tech, Painter, VA, 3Washington State University, Pullman, WA227
Advanced Machine Learning Approaches for Evaluation of Herbicide Drift Injury in Cotton. Bishwa B. Sapkota*, Muthukumar V. Bagavathiannan; Texas A&M university, College Station, TX228
Weed Classification Using Unmanned Aerial Systems-based Imagery. Vijay Singh*1, Chi Zhaohui2, Da Huo2, Michael Bishop2, Anthony Filippi2, Muthukumar V. Bagavathiannan2; 1Virginia Tech, Painter, VA, 2Texas A&M University, College Station, TX229
Efficacy of Unmanned Aerial System-based Herbicide Applications. Vijay Singh*1, Daniel Martin2, Mohamed Latheef2, Bishwa B. Sapkota3, Muthukumar V. Bagavathiannan3; 1Virginia Tech, Painter, VA, 2United States Department of Agriculture, College Station, TX, 3Texas A&M university, College Station, TX230
Nozzle Type Effect on Coverage, Canopy Penetration, and Weed Control Using Enlist One and Liberty in Enlist E3 Soybeans. Ashley N. McCormick*1, Troy W. Dillon2, Brad M. Davis2, Thomas R. Butts2, Collie M. Leah2; 1University of Arkansas System Division of Agriculture, Newport, AR, 2University of Arkansas System Division of Agriculture, Lonoke, AR231
Reimagining the Use of Electricity to Kill Weeds. Erik A. Lehnhoff*, Donovan Bailey, Paul Neher; New Mexico State University, Las Cruces, NM232
Competition Between Canada Thistle and Crops in Organic Cropping Systems of the Northern Great Plains. Daniel Chichinsky1, Tim Seipel*1, Perry Miller1, Fabian D. Menalled1, Patrick Carr2, Greta G. Gramig3; 1Montana State University, Bozeman, MT, 2Montana State University - Central Ag Research Center, Moccasin, MT, 3North Dakota State University, Fargo, ND233
Integration of Cultural Practices and Herbicides for Weed Control in Grain Sorghum and Soybean. Vipan Kumar*1, Rui Liu1, Natalie Aquilina1, Taylor Lambert1, Ramsamy Perumal1, Troy Ostmeyer1, Andrew Tucker2; 1Kansas State University, Hays, KS, 2Fort Hays State University, Hays, KS234
Common Waterhemp (Amaranthus tubercualtus): Directed Energy Manangement of Weed Seed Bank in Corn. Cadance A. Lowell*1, Marcus Nagle1, Deng Cao1, Jon Jackson2; 1Central state university, Wilberforce, OH, 2Global Neighbor, Inc., Centerville, OH235
Impact of Cotton Desiccants on Seed Viability of Palmer Amaranth (Amaranthus palmeri). Debalin Sarangi*1, Kaisa M. Werner2, Bojana Pilipovic2, Peter A. Dotray3, Muthukumar V. Bagavathiannan2; 1University of Wyoming, Powell, WY, 2Texas A&M University, College Station, TX, 3Texas Tech University and Texas A&M AgriLife Research and Extension Service, Lubbock, TX236

3MT - 3MT MS

Halauxifen-methyl: a Tool for Managing Glyphosate-resistant Weeds. Jessica E. Quinn*1, Nader Soltani1, Jamshid Ashigh2, David C. Hooker1, Darren E. Robinson1, Peter H. Sikkema1; 1University of Guelph, Ridgetown, ON, Canada, 2Corteva Agriscience, London, ON, Canada237
Diurnal Response to Dicamba and Glyphosate Applications on Broad-leaf Weed Species in Cotton. Jacob R. Kalina*1, Timothy L. Grey1, Christopher B. Corkern2, Donn G. Shilling3, Nicholas T. Basinger3; 1University of Georgia, Tifton, GA, 2Bayer Crop Sciences, Tifton, GA, 3University of Georgia, Athens, GA238
Evaluation of Active Ingredient and Application Timing on Chinese Tallow (Triadica sebifera) and Callery Pear (Pyrus calleryana) by Hack-and-squirt. Hayden Quick*1, John D. Byrd, Jr.1, David Russell2; 1Mississippi State University, Mississippi State, MS, 2Auburn University, Madison, AL239
Glyphosate Plus Dicamba Efficacy as Influenced by Spray Nozzle Design and Weed Density. Madison D. Kramer*1, Zach Perry2, Travis Legleiter3; 1University of Kentucky, Lynn, IN, 2University of Kentucky, Paducah, KY, 3University of Kentucky, Princeton, KY240
Mechanism of the Exclusive Reliance on ALS1 and ALS3 in the Evolution of Herbicide Resistance in Monochoria (Monochoria vaginalis). Shinji Tanigaki*; Kyoto University, Kyoto, Japan241
The Influence of Adjuvants on Tolpyralate Efficacy. Nicole M. Langdon*1, Peter H. Sikkema1, Darren E. Robinson1, Alan J. Raedar2, David C. Hooker1; 1University of Guelph, Ridgetown, ON, Canada, 2ISK Biosciences Inc., Concord, OH242
Overwinter Survival of Johnsongrass (Sorghum halepense) Rhizomes in Nebraska and Kansas. Samantha D. Isaacson*, Amit J. Jhala, John Lindquist; University of Nebraska-Lincoln, Lincoln, NE243
The Continued Fight Against Glyphosate Resistant Horseweed (Erigeron Canadensis (L.)). Francois Tardif1, Emily L. Priester*2, Clarence Swanton3, Eric R. Page4; 1University of Guelph, Guelph, ON, Canada, 2University of Guelph, Tillsonburg, ON, Canada, 3University of Guelph, Guelph, AZ, Canada, 4Agriculture and Agri-Food Canada, Harrow, ON, Canada244
Cucumber Tolerance to Glufosinate At-planting. Taylor M. Randell*, Jenna C. Vance, A Stanley Culpepper; University of Georgia, Tifton, GA245
Impacts of Glyphosate on Citrus Health and Productivity. Biwek Gairhe*, Ramdas Kanissery; University of Florida, Immokalee, FL246
Young Peanut Physiological Response to Flumioxazin Applications Across Multiple Planting Dates and Seed Vigors. Nicholas L. Hurdle*1, Timothy L. Grey2, Eric P. Prostko2, Walter S. Monfort2, Cristiane Pilon2; 1University of Georgia, Collierville, TN, 2University of Georgia, Tifton, GA247
Impact of Droplet Size and Carrier Volume on Soybean (Glycine max) Harvest Aid Efficacy. Steven D. Hall*1, Darrin M. Dodds2, Greg R. Kruger3, Jon T. Irby2, Jacob P. McNeal2, Lucas X. Franca2, John J. Williams2, Bradley J. Norris2, William J. Rutland1; 1Mississippi State University, Starkville, MS, 2Mississippi State University, Mississippi State, MS, 3University of Nebraska-Lincoln, North Platte, NE248
Effect of Herbicides Applied at First Visible Female Inflorescence on Palmer Amaranth (Amaranthus palmeri) Fecundity and Seed Viability. Eric B. Scruggs*, Michael L. Flessner; Virginia Tech, Blacksburg, VA249
Utility of Potassium Borate as a Volatility Reduction Agent and its Impact on Weed Control in Xtend™ Crops. Mason C. Castner*, Jason K. Norsworthy, Trenton L. Roberts; University of Arkansas, Fayetteville, AR250
HPPD Tolerant Cotton Response, Weed Management, and Tank Mix Partners with Isoxaflutole. Delaney C. Foster*1, Peter A. Dotray2, Corey Thompson3, Greg Baldwin4, Frederick Moore5; 1Texas Tech University, Lubbock, TX, 2Texas Tech University and Texas A&M AgriLife Research and Extension Service, Lubbock, TX, 3BASF, Abernathy, TX, 4BASF, Research Triangle Park, NC, 5BASF, Lubbock, TX251
Control of Glyphosate/Glufosinate-Resistant Volunteer Corn in Corn Resistant to Aryloxyphenoxypropionates. Adam Striegel*1, Stevan Knezevic2, Nevin Lawrence3, Jeffery Krumm4, Gary Hein1, Amit J. Jhala1; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Nebraska-Lincoln, Concord, NE, 3University of Nebraska-Lincoln, Scottsbluff, NE, 4Corteva Agriscience, Hastings, NE252
Understanding Interspecific Hybridization Between Sorghum bicolor and its Weedy Congener S. halepense. Cynthia Sias*, Blake L. Young, Daniel Hathcoat, George Hodnett, William Rooney, Muthukumar V. Bagavathiannan; Texas A&M University, College Station, TX253

3MT - 3MT PHD

A Target Site Mutation Confers Protoporphyrinogen Oxidase (PPO)-resistance in Wild Poinsettia (Euphorbia heterophylla L.). Rafael R. Mendes*1, Hudson K. Takano2, Fernando Storniolo Adegas3, Rubem S. Oliveira Jr.1, Todd A. Gaines2, Franck E. Dayan2; 1Maringa State University, Maringa, Brazil, 2Colorado State University, Fort Collins, CO, 3Embrapa Soybean, Londrina, Brazil254
Shedding Light on the Power of Plant Competition. Nicole Berardi*1, Clarence Swanton2; 1University of Guelph, Guelph, ON, Canada, 2University of Guelph, Guelph, AZ, Canada255
Evolved Resistance to Herbicides in Palmer Amaranth Accessions Collected in the North Carolina Coastal Plain. Denis J. Mahoney*; North Carolina State University, Clayton, NC256
Sweetpotato Tolerance to Indaziflam. Stephen C. Smith*1, Katherine M. Jennings1, David W. Monks1, Michael R. Schwarz2, David L. Jordan1, Chris Reberg-Horton1; 1North Carolina State University, Raleigh, NC, 2Affiliation Not Specified, Raleigh, NC257
Application Timing on Control of Echinochloa. Clay M. Perkins*1, Larry Steckel1, Thomas C. Mueller2, Marshall Hay3, Ethan T. Parker3; 1University of Tennessee, Jackson, TN, 2University of Tennessee, Knoxville, TN, 3Syngenta, Vero Beach, FL258
Exploring the Impacts of Weeds in Perennial Grain Crops. Eugene P. Law*1, Matthew R. Ryan1, Antonio DiTommaso2; 1Cornell University, Ithaca, NY, 2Cornell University, Dryden, NY259
Cover Crops for Suppressing Weeds in Citrus (Citrus sinensis) Row-Middles. Ramdas Kanissery1, Miurel T. Brewer*2, Davie M. Kadyampakeni3; 1University of Florida, Immokalee, FL, 2University of Florida, Arcadia, FL, 3University of Florida, Lake Alfred, FL260
Understanding Herbicide Resistance Through the Lens of Epigenetics. Gourav Sharma*, Jacob Barney, Shawn Askew, James Westwood, David Haak, Liqing Zhang, Suzanne Lalibrate; Virginia Tech, Blacksburg, VA261
Quantifying 2,4-D and Dicamba Dissipation from Plastic Mulch Using Analytical and Bioassay Techniques. Lavesta C. Hand*, Kayla M. Eason, Taylor M. Randell, Timothy L. Grey, A Stanley Culpepper; University of Georgia, Tifton, GA262
Fine Tuning Goosegrass (Eleusine indica) Control for Northern Bermudagrass. John Brewer*, Jordan M. Craft, Shawn Askew; Virginia Tech, Blacksburg, VA263
Testing Rangeland Drought Resistance in the Presence of Ventenata (Ventenata dubia). Marshall Hart*1, Brian Mealor2; 1University of Wyoming, Sheridan, WY, 2University of Wyoming, Laramie, WY264
The Effect of Low-Dose Dicamba Applications on Snap Bean (Phaseolus vulgaris), Lima Bean (Phaseolus lunatus) and Southern Cowpea (Vigna unguiculata). Hannah E. Wright*1, Thomas Gray2, John Shugart3, A Stanley Culpepper4; 1University of Georgia, Athens, GA, 2Georgia Department of Agriculture, Atlanta, GA, 3Georgia Department of Agriculture, Tifton, GA, 4University of Georgia, Tifton, GA265
Using Linuron to Improve Sweetpotato Production. Levi D. Moore*, Katherine M. Jennings, David W. Monks, Michael D. Boyette, David L. Jordan, Ramon G. Leon; North Carolina State University, Raleigh, NC266
Adapting Integrated Pest Management for Weeds in Almonds. Steven C. Haring*; University of California, Davis, Davis, CA267
Characterization of Trifludimoxazin, a New Herbicide for Use in Soybean Production Systems. Nicholas R. Steppig*1, Bryan G. Young2; 1Purdue University, Lafayette, IN, 2Purdue University, Brookston, IN268
Advanced Image Analysis for Weed Species Segmentation in Cotton. Bishwa B. Sapkota*, Muthukumar V. Bagavathiannan; Texas A&M university, College Station, TX269
Cotton (Gossypium hirsutum) Defoliation as Affected by Carrier Volume and Droplet Size. Jacob P. McNeal*1, Darrin M. Dodds1, Greg R. Kruger2, John J. Williams1, Bradley J. Norris1, Steven D. Hall3, William J. Rutland3; 1Mississippi State University, Mississippi State, MS, 2University of Nebraska-Lincoln, North Platte, NE, 3Mississippi State University, Starkville, MS270
Effect of Herbicide Program, Spray Droplet Size, and Drift Reduction Agent on Glufosinate Efficacy. John J. Williams*1, Darrin M. Dodds1, Jacob P. McNeal1, Steven D. Hall2, Bradley J. Norris1, William J. Rutland2; 1Mississippi State University, Mississippi State, MS, 2Mississippi State University, Starkville, MS271
The Genetic Diversity of Amaranthus tuberculatus: a Success Story in the American Midwest. Brent P. Murphy*, Patrick Tranel; University of Illinois, Urbana, IL272
Chromatography: the Key to Quantifying Herbicide Dissipation. Kayla M. Eason*, Timothy L. Grey, A Stanley Culpepper; University of Georgia, Tifton, GA273
Making a Better Glufosinate: Alleviating Environmental Parameters and Improving Efficacy. Grant L. Priess*, Jason K. Norsworthy; University of Arkansas, Fayetteville, AR274
Spray Away the Herbicide Antagonism. Justin S. Calhoun*1, J Connor Ferguson2, Luke H. Merritt2, Kayla L. Broster2, Zachary R. Treadway2, Michael T. Wesley Jr.2; 1Mississippi State University, Starkville, MS, 2Mississippi State University, Mississippi State, MS275
Ecological Management of Kochia in Irrigated Western Cropping Systems. Ramawatar Yadav*1, Prashant Jha1, Andrew R. Kniss2, Nevin Lawrence3, Gustavo Sbatella2; 1Iowa State University, Ames, IA, 2University of Wyoming, Laramie, WY, 3University of Nebraska-Lincoln, Scottsbluff, NE276
Microbial Contributions to Weed Suppression in Conventional and Organic Farm Soils. Liang Cheng*1, Jenny Kao-Kniffin1, Antonio DiTommaso2; 1Cornell University, Ithaca, NY, 2Cornell University, Dryden, NY277

SYMPOSIUM - 4. THE ECOLOGICAL AND BIODIVERSITY IMPACT OF INVASIVE GRASS SPECIES AND THEIR MANAGEMENT

Introduction to Symposium. Lisa J. Rew*; Montana State University, Bozeman, MT278
Lehmann Lovegrass (Eragrostis lehmanniana) Ecological Impacts and Management Opportunities. Erik A. Lehnhoff*, Sherri Buerdsell, Andrew Dominguez, Nicole Pietrasiak; New Mexico State University, Las Cruces, NM279
Reducing Invasive Grass Populations in Garry Oak Ecosystems Over the Long-term Via Mowing or Grazer Exclusion. David R. Clements*1, Vanessa L. Jones1, Joy Marconato1, Emily K. Gonzales2, Virginia Oeggerli1, Jessica Brouwer1; 1Trinity Western University, Langley, BC, Canada, 2Parks Canada, Vancouver, BC, Canada280
Plant Community Response Following Invasive Annual Grass Control in the Intermountain West. Corey V. Ransom*; Utah State University, Logan, UT281
Ventenata (Ventenata dubia) Management in Northern Mixed Prairie: Implications for Ecosystem Goods and Services. Marshall Hart*1, Brian Mealor2; 1University of Wyoming, Sheridan, WY, 2University of Wyoming, Laramie, WY282
The Impacts of Downy Brome (Bromus tectorum) on Pasture Forage Quality and Quantity in Colorado. Jacob Courkamp*; Colorado State University, Fort Collins, CO283
Perspectives on the Ecological Impacts of Annual Grasses Across the Great Divide. Lisa J. Rew1, Timothy S. Prather*2; 1Montana State University, Bozeman, MT, 2University of Idaho, Moscow, ID284
Bring Back Bees: Controlling Invasive Annual Grasses Restores Native Flowering Plants and Their Pollinators. Arathi Seshadri*; USDA ARS/WRRC/ISPH, Davis, CA285
Quail in the Grass: Controlling Cheatgrass to Enhance Nesting and Brood-rearing Habitat for Bobwhite Quail and Other Grassland Birds. Noe Marymor*; USDA-NRCS, Greeley, CO286
Facilitated Discussion. Lisa J. Rew*; Montana State University, Bozeman, MT287

ORAL - 01. AGRONOMIC CROPS

Glyphosate and AMPA Persistence and Distribution in Soils Under Field Conditions in the Midwestern USA. Robert J. Kremer*; University of Missouri, Columbia, MO288
Developing a Predictive Yield Loss Model for Sensitive Soybeans Exposed to Dicamba. Jerri Lynn Henry*1, Reid Smeda1, Jason Weirich2; 1University of Missouri, Columbia, MO, 2Affiliation Not Specified, Columbia, MO289
Implications of Dicamba and 2,4-D Tank Contamination Across Enlist and Xtend Soybean Varieties. Bryan G. Young*1, N. Cade Hayden2, Matthew Osterholt2, Mandy Bish3, Kevin W. Bradley3, Shawn P. Conley4, William G. Johnson2, Greg R. Kruger5, Jason K. Norsworthy6, Daniel B. Reynolds7, Larry Steckel8; 1Purdue University, Brookston, IN, 2Purdue University, West Lafayette, IN, 3University of Missouri, Columbia, MO, 4University of Wisconsin-Madison, Madison, WV, 5University of Nebraska-Lincoln, North Platte, NE, 6University of Arkansas, Fayetteville, AR, 7Mississippi State University, Mississippi State, MS, 8University of Tennessee, Jackson, TN290
Dicamba Rate Influences on Fruiting in Sensitive Cotton. Kyle R. Russell*1, Peter A. Dotray2, Irish L. B. Pabuayon1, Glen L. Ritchie1; 1Texas Tech University, Lubbock, TX, 2Texas Tech University and Texas A&M AgriLife Research and Extension Service, Lubbock, TX291
Influence of Carrier Water Characteristics and Adjuvants on Dicamba Volatilization in a Controlled Environment. Matthew Osterholt*1, Hayden C. Hayden1, Julie M. Young2, Manoj S. Ghaste1, William G. Johnson1, Joshua R. Widhalm1, Bryan G. Young2; 1Purdue University, West Lafayette, IN, 2Purdue University, Brookston, IN292
Dicamba Research Update. Thomas C. Mueller*1, Larry Steckel2; 1University of Tennessee, Knoxville, TN, 2University of Tennessee, Jackson, TN293
Influence of pH Buffers on Volatility of Dicamba Tank Mixtures. Ryan D. Langemeier*, Steve Li, Katilyn J. Price, Frances B. Browne; Auburn University, Auburn, AL294
Greenhouse Evaluation of Suspected Resistance to XtendiMax® Herbicide with VaporGrip® Technology as Part of the Conditions of Registration. Daljit Singh*1, Sean Evans2, Jeffrey E. Herrmann3, Chandrashekar Aradhya1; 1Bayer Crop Science, Chesterfield, MO, 2Bayer Crop Science, Jacksonville, IL, 3Bayer Crop Science, Creve Coeur, MO295
Engenia Herbicide for 2020. Tracy Rowlandson*; BASF, Raleigh, NC296
Enlist E3TM Soybean Weed Control and Crop Tolerance. David M. Simpson*; Corteva, Indianapolis, IN297
PPO-resistant Amaranthus Species Control in XtendFlex® Soybeans. Neha Rana*1, Blake Barlow2, Ryan E. Rapp3, Rod Stevenson4; 1Bayer Crop Science, St Louis, MO, 2Bayer Crop Science, Hallsville, MO, 3Bayer CropScience, Mitchell, SD, 4Bayer Crop Science, Lansing, MI298

ORAL - 02. HORTICULTURAL CROPS

Pyroxasulfone for Faba Bean and Safflower Production. Harlene M. Hatterman-Valenti*, Johnson M. Burton, Auwarter M. Collin, Kutay Yilmaz; North Dakota State University, Fargo, ND299
Strawberry Tolerance and Flumioxazin Persistence Under Plastic Mulch in Florida Strawberry. Nathan Boyd*1, Ramdas Kanissery2; 1University of Florida, Balm, FL, 2University of Florida, Immokalee, FL300
Weed Control in Organic Highbush Blueberries. Marcelo L. Moretti*; Oregon State University, Corvallis, OR301
Screening of Herbicides for Selective Weed Control in Brassicaceous Crops. Ed Peachey*; Oregon State University, Corvallis, OR302
Don't be a Wet Blanket - Hit the Bullseye in Potatoes with Targeted Tank Mixes. Pamela J.s. Hutchinson*; University of Idaho, Aberdeen, ID303
Two Chipping Potato Cultivar Plant Back Responses When Mother Plants Received Sub-lethal Dicamba And/or Glyphosate Rates. Matthew Brooke, Collin M. Auwarter, Harlene M. Hatterman-Valenti*; North Dakota State University, Fargo, ND304
Marking of Vegetable Crop Plants to Ensure Recognition by Automated Weeders. HannahJoy Kennedy1, Steve Fennimore*1, David Slaughter2; 1University of California, Davis, Salinas, CA, 2University of California, Davis, Davis, CA305
Inter-row Cultivation Integrated with Residual Herbicide Programs in Sugarbeet. Nathan H. Haugrud*1, Thomas J. Peters2; 1North Dakota State University, Fargo, ND, 2North Dakota State University / University of Minnesota, Fargo, ND306
Better Bunch: Evaluating the Impact of Sweetpotato Growth Habit on Yield and Weed Competition. Matthew A. Cutulle*1, Phillip Wadl2; 1Clemson University, Charleston, SC, 2USDA-ARS, Charleston, SC307
Yellow Nutsedge (Cyperus esculentus) Interference in Simulated Sweetpotato (Ipomoea batatas) Plant Beds. Stephen L. Meyers*1, T. Casey Barickman2, Jeffrey L. Main3; 1Purdue University, West Lafayette, IN, 2Mississippi State University, Verona, MS, 3Mississippi State University, Pontotoc, MS308
Trends in Collaboration: Minor Use Foundation, Inc. - Working with Governments, Grower Groups, and Specialty Crop and Minor Use Organizations on Techology Tools. Dirk C. Drost*; Minor Use Foundation, Inc, High Point, NC309
The Effect of 2,4-D on Hazelnut Abscission. Larissa Larocca De Souza, Marcelo L. Moretti*; Oregon State University, Corvallis, OR310

ORAL - 09. WEED BIOLOGY AND ECOLOGY

Predict Invasive Potential of a Weed Likely to Increase with Climate Change. Hannah Duff*, Bruce Maxwell; Montana State University, Bozeman, MT311
The Evolutionary Genomics of Herbicide-Resistant Weeds. Bridgit W. Vasiljevic*, Ulrich Lutz, Ilja Bezrukov, Detlef Weigel; Max Planck Institute for Developmental Biology, Tübingen, Germany312
Do Certain Nutrients and Plant-Soil Feedbacks Affect Ventenata dubia (Ventenata) Seedling Growth? Michelle L. Majeski*, Catherine Zabinski, Lisa J. Rew, Jane Mangold; Montana State University, Bozeman, MT313
Developing Growing Degree Day Models to Manage Annual Polygonum Species in Western Washington. Steven S. Seefeldt*1, Chris Benedict2, Brian Maupin1; 1Washington State University, Mount Vernon, WA, 2Washington State University, Bellingham, WA314
EPSPS Gene Amplification Confers Glyphosate Resistance in Bromus tectorum (Downy Brome). Pragya Asthana*, Rachel J. Zuger, Rhoda Brew-Appiah, Karen Sanguinet, Ian Burke; Washington State University, Pullman, WA315
Escaping Proteolysis: A 27 Base Pair Deletion in AUX/IAA2 Degron Tail Confers Resistance to Auxinic Herbicides in Sisymbrium orientale. Marcelo Figueiredo*1, Anita Küpper2, Christopher Preston3, Jenna Malone4, Tijana Petrovic4, Anireddy Reddy1, Kasavajhala Prasad1, Todd A. Gaines1; 1Colorado State University, Fort Collins, CO, 2Bayer, Frankfurt, Germany, 3University of Adelaide, Glen Osmond, Australia, 4University of Adelaide, Adelaide, Australia316
Acetolactate Synthase Inhibitor Resistance in Ontario Populations of Chenopodium album L. Clement Mo*1, Francois Tardif2; 1University of Guelph, Markham, ON, Canada, 2University of Guelph, Guelph, ON, Canada317
Weighing the Mechanisms of Yield Loss: from the Bucket to the Field. Joe G. Ballenger*, Albert T. Adjesiwor, David A. Claypool, Andrew R. Kniss; University of Wyoming, Laramie, WY318
Horseweed (Erigeron canadensis) Emergence Time and Over-winter Mortality. Erin Haramoto*1, Ryan Collins1, Anita Dille2, Karla L. Gage3, Reid Smeda4, Brent Sunderlage3; 1University of Kentucky, Lexington, KY, 2Kansas State University, Manhattan, KS, 3Southern Illinois University Carbondale, Carbondale, IL, 4University of Missouri, Columbia, MO319
Status of Herbicide-Resistant Kochia (Bassia scoparia) and Palmer Amaranth (Amaranthus palmeri) in Colorado. Andrew D. Effertz*, Philip Westra, Eric P. Westra; Colorado State University, Fort Collins, CO320
Exploring the Dynamics of EPSPS and Abiotic Stress Genes in Kochia. Philip Westra*1, Andrew D. Effertz1, Todd A. Gaines1, Crystal D. Sparks1, Eric L. Patterson2; 1Colorado State University, Fort Collins, CO, 2Michigan State University, East Lansing, MI321

ORAL - 11. PHYSIOLOGY

Target Site-Based Resistance to ALS Inhibitors, Glyphosate, and PPO Inhibitors in a Palmer Amaranth Accession from Mississippi. Vijay Nandula*1, Darci A. Giacomini2, William T. Molin1; 1USDA-ARS, Stoneville, MS, 2University of Illinois, Urbana, IL322
A Safener Does Influence Pacific Northwest Winter Wheat Varietal Response to Very-Long-Chain Fatty Acid-Inhibiting Herbicides. Damilola A. Raiyemo*1, William J. Price1, Traci Rauch1, Joan M. Campbell1, Fangming Xiao1, Rong Ma2, Timothy S. Prather1; 1University of Idaho, Moscow, ID, 2Bayer CropScience, Chesterfield, MO323
Cyperus difformis ALS Cross-resistance Levels and Target-site Characterization. Alex R. Ceseski*, Kassim Al-Khatib; University of California, Davis, Davis, CA324
Simultaneous Overexpression of Three Cytochrome P450s is Involved in High Level Resistance to Diclofop-methyl in Multiple-herbicide Resistant Late Watergrass (Echinochloa phyllopogon). Hiroe Suda*1, Yusuke Yoshimoto1, Kohei Kurata1, Keisuke Tanaka2, Satoru Tanaka2, Takuya Yamaguchi3, Masahiro Miyashita1, Tohru Tominaga1, Satoshi Iwakami1; 1Kyoto University, Kyoto, Japan, 2Tokyo University of Agriculture, Tokyo, Japan, 3University of Tsukuba, Tsukuba, Japan325
Herbicide-Resistance In Waterhemp (Amaranthus tuberculatus) Identified in Israel is Due to a Long Distance Gene Transfer. Inon Yadid, Zvi Peleg, Baruch Rubin*; The Hebrew University of Jerusalem, Rehovot, Israel326
Candidate Mutations for Fluroxypyr Resistance in Kochia (Bassia Scoparia) from Colorado. Olivia E. Todd*, Todd A. Gaines; Colorado State University, Fort Collins, CO327
A Non-destructive Leaf Disc Assay for Rapid Diagnosis of Weed Resistance to Multiple Herbicide Modes of Action. Chenxi Wu*1, Vijaya Varanasi1, Alejandro Perez-Jones2; 1Bayer CropScience, St Louis, MO, 2Bayer Crop Science, Chesterfield, MO328
Investigation of Physiological Mechanism of 2,4-D Resistance in Palmer Amaranth (Amaranthus palmeri). Chandrima Shyam*, Dallas E. Peterson, Mithila Jugulam; Kansas State University, Manhattan, KS329
Investigating Metabolic Resistance to S-Metolachlor in Two Illinois Waterhemp (Amaranthus tuberculatus) Populations. Seth A. Strom*1, Aaron Hager1, Nicholas J. Seiter1, Adam Davis1, Shiv S. Kaundun2, Dean E. Riechers1; 1University of Illinois, Urbana, IL, 2Syngenta, Bracknell, United Kingdom330
A New Understanding on the Mechanism of Action of Glufosinate. Franck E. Dayan*1, Roland S. Beffa2, Christopher Preston3, Philip Westra1, Hudson K. Takano1; 1Colorado State University, Fort Collins, CO, 2Bayer AG, CropScience Division, Frankfurt, Germany, 3University of Adelaide, Glen Osmond, Australia331
A Biochemical Approach to Improve the Efficacy of Glufosinate. Hudson K. Takano*1, Roland S. Beffa2, Christopher Preston3, Philip Westra1, Franck E. Dayan1; 1Colorado State University, Fort Collins, CO, 2Bayer AG, CropScience Division, Frankfurt, Germany, 3University of Adelaide, Glen Osmond, Australia332

SYMPOSIUM - 3. GENOMICS OF WEEDY AND INVASIVE SPECIES - 2025 AND BEYOND

Introduction to Symposium. Mithila Jugulam*; Kansas State University, Manhattan, KS333
The International Weed Genomics Consortium: A Resource for Weed Genomics. Todd A. Gaines*1, Sarah Morran1, Paul Neve2, Eric L. Patterson3, Joseph S. McElroy4, Roland S. Beffa5, Mithila Jugulam6, Patrick Tranel7; 1Colorado State University, Fort Collins, CO, 2Rothamsted Research, Harpenden, United Kingdom, 3Michigan State University, East Lansing, MI, 4Auburn University, Auburn, AL, 5Bayer AG, CropScience Division, Frankfurt, Germany, 6Kansas State University, Manhattan, KS, 7University of Illinois, Urbana, IL334
Systems Biology and Synthetic Biology Unite: Towards Elucidation of Non-target Herbicide Resistance Mechanism in Conyza.. Charles Neal Stewart*, Cristiano Piasecki, Yongil Neal Yang, Bryce Trull, Reginald Millwood; University of Tennessee, Knoxville, TN335
New Tools to Investigate and Manipulate Black-grass (Alopecurus myosuroides). Dana R. MacGregor*; Rothamsted Research, Harpenden, United Kingdom336
Using Genomics to Investigate Dioecy in Amaranthus Species. Patrick Tranel*; University of Illinois, Urbana, IL337
Molecular Cytogenetic Analysis of Herbicide-resistant Weeds. Dal-Hoe Koo*, Mithila Jugulam, Bernd Friebe, Bikram S. Gill; Kansas State University, Manhattan, KS338
The eccDNA Replicon, Adaptive Potential, and Functional Genomics in Amaranthus Palmeri. Christopher A. Saski*1, William T. Molin2; 1Clemson University, Clemson, SC, 2USDA-ARS, Stoneville, MS339
The Genome of Kochia scoparia: A Story of Evolution in Action. Eric L. Patterson*1, Todd A. Gaines2, Christopher A. Saski3, Philip Westra2, Crystal D. Sparks2; 1Michigan State University, East Lansing, MI, 2Colorado State University, Fort Collins, CO, 3Clemson University, Clemson, SC340
Canada Fleabane Genome Sequence. Martin Laforest*1, Sara L. Martin2, Eric R. Page3; 1AAC-AAFC, St-jean-sur-richelieu, QC, Canada, 2AAC-AAFC, Ottawa, ON, Canada, 3Agriculture and Agri-Food Canada, Harrow, ON, Canada341
Symposium Discussion. Mithila Jugulam*; Kansas State University, Manhattan, KS342

ORAL - 01. AGRONOMIC CROPS

Control of Multiple-herbicide-resistant Waterhemp in Corn. Christian A. Willemse*1, Peter H. Sikkema1, Amit J. Jhala2, Darren E. Robinson1, David C. Hooker1; 1University of Guelph, Ridgetown, ON, Canada, 2University of Nebraska-Lincoln, Lincoln, NE343
Does Amplification of the EPSPS Gene Alone Confer Glyphosate Resistance in Common Waterhemp. Balaji Aravindhan Pandian*, Sanzhen Liu, P.V. Vara Prasad, Tesfaye Tesso, Mithila Jugulam; Kansas State University, Manhattan, KS344
Control of Glyphosate-Resistant Canada Fleabane with Three-Way Tankmixes in Soybean. Peter H. Sikkema*, Nader Soltani; University of Guelph, Ridgetown, ON, Canada345
Horseweed (Erigeron canadensis) Growth Stage Response to Herbicide Technologies. Aaron Froemke*1, Kirk A. Howatt2; 1North Dakota State University, Lisbon, ND, 2North Dakota State University, Fargo, ND346
A Kochia Population with Possible Field Resistance to Dicamba, Fluroxypr and Glyphosate. Randall S. Currie*1, Patrick Geier1, Chandrima Shyam2, Mithila Jugulam2; 1Kansas State University, Garden City, KS, 2Kansas State University, Manhattan, KS347
Characterizing Response of Glyphosate-, Dicamba-, and Fluroxypyr-Resistant Kochia to Atrazine and Metribuzin. Rui Liu*1, Vipan Kumar1, Randall S. Currie2, Patrick Geier2, Taylor Lambert1, Phillip W. Stahlman1; 1Kansas State University, Hays, KS, 2Kansas State University, Garden City, KS348
Heat Stress and Recurrent Herbicide Application May Speed the Evolution of Junglerice Tolerant to Florpyrauxifen-benzyl. Lariza Benedetti1, Nilda Roma-Burgos2, Luis A. Avila*1; 1Universidade Federal de Pelotas, Pelotas, Brazil, 2University of Arkansas, Fayetteville, AR349
Evaluation of Herbicide Resistance in Diverse Palmer Amaranth and Waterhemp Populations in the USA. Alejandro Perez-Jones*1, Rong Ma1, Chenxi Wu2, Chandrashekar Aradhya1; 1Bayer Crop Science, Chesterfield, MO, 2Bayer CropScience, St Louis, MO350
Investigation of Herbicide-resistant Redroot Pigweed (Amaranthus retroflexus) Populations in North Carolina. Eric A. Jones*, Wesley Everman, Ramon G. Leon; North Carolina State University, Raleigh, NC351
Synthetic Auxins and Glufosinate Applied Sequentially for Control of Palmer Amaranth and Associated Physiological Response. Frances B. Browne*, Steve Li, Katilyn J. Price, Ryan D. Langemeier; Auburn University, Auburn, AL352
Waterhemp (Amaranthus tuberculatus) and Palmer Amaranth (Amaranthus palmeri) Control in a Glyphosate, Glufosinate, and Dicamba Resistant Soybean Variety. Travis Legleiter*1, J. D. Green2; 1University of Kentucky, Princeton, KY, 2University of Kentucky, Lexington, KY353
The Importance of Glufosinate for Managing Palmer Amaranth (Amaranthus palmeri) in Auxin-Based Herbicide Systems. Grace F. Flusche Ogden*1, Peter A. Dotray2, John Everitt3; 1Texas Tech University, Lubbock, TX, 2Texas Tech University and Texas A&M AgriLife Research and Extension Service, Lubbock, TX, 3Bayer - US Crop Science, Shallowater, TX354
Efficacy of a New Fluroxypyr + Arylex Active Weed Control Product in Wheat. Mike Moechnig*1, Jeffery Krumm2, Joe Yenish3, Bruce Steward4, Patti Prasifka5, Dave Johnson6, Mike Lovelace7; 1Corteva Agriscience, Brookings, SD, 2Corteva Agriscience, Hastings, NE, 3Corteva Agriscience, Billings, MT, 4Corteva, Oklahoma City, OK, 5Corteva Agriscience, West Fargo, ND, 6Corteva Agriscience, Eagan, MN, 7Corteva Agriscience, Lubbock, TX355
Assessment of Potential Allelopathic Effects of Pacific Northwest Winter Wheat Cultivars on Annual Weeds. Haifeng Xing1, Steve Young*2; 1Inner Mongolia Agricultural University, Hohhot City, China, 2Utah State University, Logan, UT356
Efficacy and Crop Safety of a New Broadleaf Herbicide for Northern Plains Cereals Containing, Clopyralid, Halauxifen-methyl, and Fluroxypyr. Joe Yenish*1, Patti Prasifka2, Dave Johnson3, Mike Moechnig4; 1Corteva Agriscience, Billings, MT, 2Corteva Agriscience, West Fargo, ND, 3Corteva Agriscience, Eagan, MN, 4Corteva Agriscience, Brookings, SD357
Feral Rye (Secale cereale) Control and Economics with ACCase Tolerant Wheat Production System in Colorado. Eric P. Westra*, Todd A. Gaines; Colorado State University, Fort Collins, CO358
Four Seasons of Italian Ryegrass (Lolium perenne Ssp. multiflorum) Management in Oklahoma Winter Wheat. Misha R. Manuchehri*, Justin T. Childers, Hannah C. Lindell, Lane S. Newlin; Oklahoma State University, Stillwater, OK359
Is Dichlorprop-p Less Antagonistic Than 2,4-D to Group 1 Herbicides in Wheat? Kirk A. Howatt*1, Joseph Mettler1, Paul O. Johnson2, Bob Bruss3; 1North Dakota State University, Fargo, ND, 2South Dakota State University, Brookings, SD, 3Nufarm Americas, Morrisville, NC360
The Extent of Herbicide Resistance in Key Weeds of the Southeastern Australian Grain Production Region. Christopher Preston*1, John C. Broster2, Peter Boutsalis1, Gurjeet S. Gill3; 1University of Adelaide, Glen Osmond, Australia, 2Charles Sturt University, Wagga Wagga, Australia, 3University of Adelaide, Adelaide, Australia361
Herbicide Metabolism Affects Quizalofop Tolerance of CoAXium Wheat. Raven A. Bough*, Franck E. Dayan, Todd A. Gaines; Colorado State University, Fort Collins, CO362
Voraxor: a New Novel Herbicide for Grass and Broadleaf Weed Control in Australian Winter Cereals. Ian Francis*1, Marco Montagna2, Russell Ison1, Gavin Heard3; 1BASF Australia, Tamworth, Australia, 2BASF Australia, Bannockburn, Australia, 3BASF Australia, Melbourne, Australia363
Non-Tolerant Wheat Response to Quizalofop-P-ethyl in Central Oklahoma. Justin T. Childers*1, Misha R. Manuchehri1, Vipan Kumar2, Tyson Ochsner1, Rui Liu2, Hannah C. Lindell1, Lane S. Newlin1; 1Oklahoma State University, Stillwater, OK, 2Kansas State University, Hays, KS364
Dichlorprop-p Combinations with Auxin Herbicides for Weed Control in Chemical Fallow. Philip Westra*1, Kirk A. Howatt2, Greg R. Kruger3, Peter A. Dotray4, Misha R. Manuchehri5, Vipan Kumar6, Bob Bruss7; 1Colorado State University, Fort Collins, CO, 2North Dakota State University, Fargo, ND, 3University of Nebraska-Lincoln, North Platte, NE, 4Texas Tech University and Texas A&M AgriLife Research and Extension Service, Lubbock, TX, 5Oklahoma State University, Stillwater, OK, 6Kansas State University, Hays, KS, 7Nufarm Americas, Morrisville, NC365
Dicotyledonous Weed Control with Pulse-Width Modulation (PWM) Technology. Kelly T. Satrom*, Kirk A. Howatt; North Dakota State University, Fargo, ND366

ORAL - 02. HORTICULTURAL CROPS

Overlapping S-Metolachlor Treatments for Weed Control in Lima Bean. Kurt M. Vollmer*1, Mark VanGessel2, Quintin R. Johnson2, Barbara A. Scott2; 1University of Maryland, Queenstown, MD, 2University of Delaware, Georgetown, DE367
Investigating the Genetic Basis of Herbicide Tolerance in Snap Bean. Martin Williams*1, Alvaro Garzon2, Phillip Miklas2, James Myers3, Ed Peachey3; 1USDA-ARS, Urbana, IL, 2USDA-ARS, Prosser, WA, 3Oregon State University, Corvallis, OR368
Using Rimsulfuron Tank Mixes to Extend Residual Control of Pindar GT in Southeast Orchards. Christopher Holmberg*, Wayne E. Mitchem; North Carolina State University, Mills River, NC369
Penoxsulam+Oxyfluorfen For Residual Weed Management in Western Pecans. Jesse M. Richardson*1, William B. McCloskey2; 1Corteva Agriscience, Mesa, AZ, 2University of Arizona, Tucson, AZ370
Efficacy of Preemergent Herbicides in Watermelon Production on Bareground Vs. a Cereal Rye Cover. Matthew B. Bertucci*1, Amanda McWhirt1, Alden Hotz2, Lesley B. Smith2; 1University of Arkansas, Fayetteville, AR, 2University of Arkansas, Alma, AR371
Novel Weed Management Tools for Horticulture Production in Florida. Ramdas Kanissery*; University of Florida, Immokalee, FL372
Growth and Reproductive Response of Vidal Blanc Grapes to Dicamba. Sarah E. Dixon*, Reid Smeda; University of Missouri, Columbia, MO373
Invasions of a New Species, Alkaliweed (Crussa truxillensis) in Orchards of California. Anil Shrestha*1, James Schaeffer1, Kurt J. Hembree2; 1California State University, Fresno, Fresno, CA, 2University of California Cooperative Extension, Fresno, CA374
Grape (Vitis vinifera) Response to 2,4-D Choline Applied as a Directed Spray in Vineyards. Wayne E. Mitchem*1, Kira C. Sims2, Christopher Holmberg1, Katherine M. Jennings3; 1North Carolina State University, Mills River, NC, 2North Carolina State University, Goldsboro, NC, 3North Carolina State University, Raleigh, NC375
Effective Management of Yellow Nutsedge in Onion Depends on Herbicides Used in Preceding Crop Rotations. Joel Felix*1, Joey Ishida1, George Newberry2; 1Oregon State University, Ontario, OR, 2Gowan Company, Boise, ID376

ORAL - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

Scotch Broom (Cytisus scoparius) Seed Germination Responses to Light. Timothy B. Harrington*; USDA Forest Service - PNW Research Station, Olympia, WA377
Revitalizing the Use of Crested Wheatgrass (Agropyron cristatum) for the Management of Annual Invasive Grasses. Emily B. Repas*, Daniel R. Tekiela; University of Wyoming, Laramie, WY378
Management Scale Application of Aminopyralid to Sterilize Medusahead (Taeniatherum caput-medusae) Seed on Rangeland. Jeremy James*1, Matthew J. Rinella2, Josh Davy3, Larry Forero4; 1University of California Division of Agriculture and Natural Resources, Browns Valley, CA, 2USDA-ARS, Miles City, MT, 3University of California Division of Agriculture and Natural Resources, Red Bluff, CA, 4University of California Division of Agriculture and Natural Resources, Redding, CA379
Impact of Relative Early Emergence and Growth Rates of Cool-season Bunchgrasses on Priority Effects with Invasive Grasses. Jaycie N. Arndt*1, Brian Mealor2; 1University of Wyoming, Arvada, WY, 2University of Wyoming, Laramie, WY380
Perennial Pepperweed: Does the Drizzle Method of Herbicide Application Work? Thomas J. Getts*; University of California Cooperative Extension, Susanville, CA381
Plant Community Data May Improve Susceptibility Modeling for Two Hieracium Species in the Greater Yellowstone Ecosystem. Christie Hubbard Guetling*1, Lisa C. Jones1, Don W. Morishita2, Eva K. Strand1, Julia L. Piaskowski1, Timothy S. Prather1; 1University of Idaho, Moscow, ID, 2University of Idaho, Kimberly, ID382
Evaluating Native Plant Community Response to Prescribed Burning and Indaziflam. Rachel H. Seedorf*, Shannon Clark, Scott J. Nissen; Colorado State University, Fort Collins, CO383
Invader or Not? Utilizing Drone Remote Sensing to Identify Dalmatian Toadflax (Linaria dalmatica) in Rangelands. Chloe M. Mattilio*, Daniel R. Tekiela; University of Wyoming, Laramie, WY384
Integrated Management of Leafy Spurge (Euphorbia esula) Seed Production in a Riparian Ecosystem. Hannah A. D. Kuhns*, Daniel R. Tekiela; University of Wyoming, Laramie, WY385
Western Salsify (Tragopogon dubias) and Cutleaf Vipergrass (Scorzonera laciniata) Response to Selective Herbicides. Shannon Clark*1, Rachel H. Seedorf1, Derek J. Sebastian2, Scott J. Nissen1; 1Colorado State University, Fort Collins, CO, 2Bayer, Greeley, CO386
Evaluating the Efficacy of Herbicide to Manage Cheatgrass (Bromus tectorum) in High Elevation Sagebrush Steppe. Colter Mumford*, Jane Mangold, John Winnie, Catherine Zabinski, Lisa J. Rew; Montana State University, Bozeman, MT387
Could Plant - Soil Feedback Play a Role in Ventenata dubia'S Invasion of the Inland Pacific Northwest? Lisa C. Jones*, Brenda Schroeder, Timothy S. Prather; University of Idaho, Moscow, ID388

ORAL - 07. TEACHING AND EXTENSION/ TEACHING AND TECHNOLOGY TRANSFER

Herbicide Diversity Calculator: Interactive Web App That Estimates the Risk of Herbicide Resistance. Andrew R. Kniss1, Albert T. Adjesiwor*1, Nevin Lawrence2; 1University of Wyoming, Laramie, WY, 2University of Nebraska-Lincoln, Scottsbluff, NE389
Glyphosate and Seed Germination, is the Jury Still Out ? William T. Cobb*; Cobb Consulting Services, Kennewick, WA390
Lessons Learned: Implementing Ventenata and Medusahead EDRR on a Mixed Ownership Landscape. Andrew Cassiday*1, Brian Mealor2, Luke Sander3, Lindy Garner4, Oakley Ingersoll1, Carrie Rogaczewski5; 1USDA NRCS, Sheridan, WY, 2University of Wyoming Sheridan Research and Extension Center, Laramie, WY, 3Sheridan County Weed and Pest, Sheridan, WY, 4USFWS, Great Falls, MT, 5Sheridan County Conservation District, Sheridan, WY391
Machine Vision: A Promising Tool for Smart Farming. Aman Rana*, Jeffrey Derr; Virginia Tech, Virginia Beach, VA392
Winfield® United Clinics: Show and Tell for 21st Century Agriculture. Gregory K. Dahl*1, Ryan J. Edwards2, Lillian C. Magidow2, Annie Makepeace2, Genevieve M. Mrnak2; 1WinField United, Eagan, MN, 2WinField United, River Falls, WV393
2019 National Survey Results for the Most Common and Troublesome Weeds in Broadleaf Crops, Fruits, and Vegetables. Lee Van Wychen*; Weed Science Society of America, Alexandria, VA394
The History and Future of Adjuvant Research and Education. Joe V. Gednalske1, Gary Halvorson*2; 1Council of Producers & Distributors of Agrotechnology, Washington, DC, 2Council of Producers and Distributors of Agrotechnology, Washington, DC395
Using Plot Demonstrations to Improve Herbicide Decisions for Waterhemp in Iowa. Meaghan Anderson*1, Angie Rieck-Hinz2; 1Iowa State University, Nevada, IA, 2Iowa State University, Clarion, IA396
Survey of Rice Growing Practices in California Identifies Perceptions and Management of Weeds and Weedy Rice. Elizabeth Karn1, Serena Bhagirath1, Luis Espino2, Whitney Brim-DeForest*1; 1University of California Division of Agriculture and Natural Resources, Yuba City, CA, 2University of California Division of Agriculture and Natural Resources, Oroville, CA397
An Update on Herbicide-Resistant Kochia and Palmer Amaranth in Western Kansas. Vipan Kumar*1, Rui Liu1, Taylor Lambert1, Randall S. Currie2, Phillip W. Stahlman1; 1Kansas State University, Hays, KS, 2Kansas State University, Garden City, KS398
Weeds Week: Using Social Media to Teach About Weed Control. Jeanne S. Falk Jones*; Kansas State University, Colby, KS399

ORAL - 09. WEED BIOLOGY AND ECOLOGY

Invasive Annual Grass Mapping with Remotely Sensed Landscape Phenology. Ty C. Nietupski*1, Becky K. Kerns2; 1Oregon State University, Corvallis, OR, 2US Forest Service - PNW Research Station, Corvallis, OR400
Kochia (Bassia scoparia) Biology and Ecology Provide Insight into Optimal Management Scenarios. Charles M. Geddes*; Agriculture and Agri-Food Canada, Lethbridge, AB, Canada401
A Multi-state Examination of Weed Phenology and its Drivers. Lauren M. Lazaro*1, Lovreet S. Shergill2, Jeffrey Evans3, Muthukumar V. Bagavathiannan4, Mandy Bish5, Jason A. Bond6, Kevin W. Bradley5, William S. Curran7, Adam Davis8, Wesley Everman9, Michael L. Flessner10, Nicholas Jordan11, John Lindquist12, Jason K. Norsworthy13, Larry Steckel14, Mark VanGessel15, Steven B. Mirsky16; 1Louisiana State University AgCenter, Baton Rouge, LA, 2USDA-ARS & University of Delaware, Beltsville, MD, 3Farmscape Analytics, Concord, NH, 4Texas A&M University, College Station, TX, 5University of Missouri, Columbia, MO, 6Mississippi State University, Stoneville, MS, 7Penn State University, University Park, PA, 8University of Illinois, Urbana, IL, 9North Carolina State University, Raleigh, NC, 10Virginia Tech, Blacksburg, VA, 11University of Minnesota, Saint Paul, MN, 12University of Nebraska-Lincoln, Lincoln, NE, 13University of Arkansas, Fayetteville, AR, 14University of Tennessee, Jackson, TN, 15University of Delaware, Georgetown, DE, 16USDA-ARS, Beltsville, MD402
How is Dicamba Doing on Palmer Amaranth (Amaranthus palmeri) in the US Mid-South? Nilda Roma-Burgos*1, Matheus Machado Noguera1, Larry Steckel2, James W. Heiser3, Taghi Bararpour4, Robert L. Nichols5; 1University of Arkansas, Fayetteville, AR, 2University of Tennessee, Jackson, TN, 3University of Missouri, Portageville, MO, 4Mississippi State University, Stoneville, MS, 5Cotton Incorporated, Cary, NC403
Impact of Elevated Temperature, CO2, and Soil Moisture Stress on Seed and Plant Morphological Traits of Italian Ryegrass (Lolium multiflorum). Aniruddha Maity*1, Zorica Vasic1, Victor Cieza2, Gerald Ray Smith3, Muthukumar V. Bagavathiannan1; 1Texas A&M University, College Station, TX, 2Department of Soil and Crop Sciences, Texas A&M University, College Station, TX, 3Texas A&M University, Overton, TX404
The Effects of Desiccation on Broad-leaved Dock (Rumex obtusifolius) and Curled Dock (Rumex crispus) Root Fragment Regeneration. Khalid S. Alshallash*; Shaqra University / Saudi Arabia, Riyadh, Saudi Arabia405
Ethical Considerations for Predicting Future Distribution of Weeds. Bruce Maxwell*; Montana State University, Bozeman, MT406
A Model for Simulating Crop-Weed Competition for Light, Soil Water and Nitrogen. John Lindquist*1, Lammert Bastiaans2, Xinyou Yin2; 1University of Nebraska-Lincoln, Lincoln, NE, 2Wageningen University and Research, Wageningen, Netherlands407
Climate-Mediated Weed Species Composition Shifts in a Rainfed Corn System. Erin E. Burns*; Michigan State University, East Lansing, MI408
Development of a Novel Derived Polymorphic Amplified Cleaved Sequence (dPACS) Assay for the Identification of the Resistance-Causing D210 PPO Codon Deletion in Amaranthus and Ambrosia Species. Shiv S. Kaundun*, Sarah-Jane Hutchings, Elisabetta Marchegiani, Ruben Rauser, Lucy V. Jackson; Syngenta, Bracknell, United Kingdom409
An IAA16 Mutation Endowing Dicamba Resistance in Kochia (Bassia scoparia) Also Alters Plant Architecture, Vegetative and Reproductive Development, and Reduces Plant Competitiveness. Chenxi Wu*1, Marta Paciorek1, Sherry LeClere1, Kang Liu1, Alejandro Perez-Jones2, Philip Westra3, Doug Sammons4; 1Bayer CropScience, St Louis, MO, 2Bayer Crop Science, Chesterfield, MO, 3Colorado State University, Fort Collins, CO, 4Sammons BFC LLC, St Louis, MO410
Common Sowthistle (Sonchus oleraceus) and Prickly Lettuce (Lactuca serriola) in Lentil (Lens culinaris) Crops of Southern Australia: Managing Herbicide Resistance and Highly Mobile Resistance Genes. Alicia B. Merriam*1, Jenna Malone1, Gurjeet S. Gill1, Christopher Preston2; 1University of Adelaide, Adelaide, Australia, 2University of Adelaide, Glen Osmond, Australia411

SYMPOSIUM - 1. 2020 VISION FOR HAWAIIAN INVASIVE PLANT MANAGEMENT

Introduction to Symposium. David R. Clements*1, Curtis Daehler2; 1Trinity Western University, Langley, BC, Canada, 2University of Hawaii at Manoa, Honolulu, HI412
Invasive Plant Establishment and Spread in the Hawaiian Islands: History, Current Trends, and Strategies for Prevention. Curtis Daehler*, Kelsey Brock; University of Hawaii at Manoa, Honolulu, HI413
The Risk and Resources for Mitigating an Incipient Miconia Invasion. David Lewis*1, James Leary2, Kimberly Burnett3, Chris Wada3, Brooke Mahnken4; 1University of Hawaii at Manoa- Department of Natural Resources and Environmental Management, Honolulu, HI, 2University of Florida, Gainesville, FL, 3University of Hawaii at Manoa- University of Hawaii Office of Economic Research, Honolulu, HI, 4University of Hawaii at Manoa- Maui Invasive Species Committee, Makawao, HI414
Synergies Between Nonnative Ungulate and Plant Invasions in Hawai'i – Can the Tide be Turned? Creighton M. Litton*1, Rebecca J. Cole2, Jed P. Sparks3, Christian P. Giardina4, Amanda Knauf1; 1University of Hawaii at Manoa, Honolulu, HI, 2Osa Conservation, Puerto Jiménez, Costa Rica, 3Cornell University, Ithaca, NY, 4Institute of Pacific Islands Forestry, USDA Forest Service, Hilo, HI415
Challenges for Restoration of Invaded Hawaiian Landscapes: Why We Need the Hybrid Ecosystem Concept. Rebecca Ostertag*1, Nicole DiManno1, Susan Cordell2, Amanda Uowolo2; 1University of Hawaii at Hilo, Hilo, HI, 2Institute of Pacific Islands Forestry, USDA Forest Service, Hilo, HI416
Challenges for Restoration of Invaded Hawaiian Wet Forest Ecosystems. Christy Martin*; UH PCSU/Coordinating Group on Alien Pest Species, Honolulu, HI417
Challenges for Restoration of Invaded Hawaiian Dry Forest Ecosystems. Susan Cordell*; Institute of Pacific Islands Forestry, USDA Forest Service, Hilo, HI418
Hawaiian Invasions as a Call for Help for Invasions Throughout the Pacific Islands – What Hope is There for the Future of Island Ecosystems? David R. Clements*; Trinity Western University, Langley, BC, Canada419
Discussion. David R. Clements*1, Curtis Daehler2; 1Trinity Western University, Langley, BC, Canada, 2University of Hawaii at Manoa, Honolulu, HI420

SYMPOSIUM - 2. THE ROLE OF INTELLIGENT MACHINES IN WEED MANAGEMENT

Introduction to Symposium. Sharon Clay*; South Dakota State University, Brookings, SD421
Deep Learning and Weed Management - from Data Acquisition to Control of Herbicide-Resistant Weeds. William L. Patzoldt*; Blue River Technology, Sunnyvale, CA422
Weed 4.0—A Data-Driven Weed Science and Technology. Mohsen B. Mesgaran*; University of California, Davis, Davis, CA423
Tackling the Herbicide Resistant Weed Crisis with Teams of Mechanical Agbots. Girish Chowdhary*; University of Illinois, Champaign, IL424
Autonomous Weeding in Vegetable Crops. Thomas Palomares*; FarmWise, San Francisco, CA425
Economic Considerations for Automated Weed Management in Vegetable Crops. Laura Tourte*; University of California Cooperative Extension, Watsonville, CA426
Linkage Between Workforce Development and Precision Agriculture Diffusion. Scott Fausti*1, Sumadhur Shakya1, Sharon Clay2, David Clay2, Bruce Erickson3; 1California State Univ. Monterey Bay, Marina, CA, 2South Dakota State University, Brookings, SD, 3Purdue University, West Lafayette, IN427
2D And 3D Vision Techniques for Crop Plant Detection in Mechanical Intra-row Weed Control. Lie Tang*; Iowa State University, Ames, IA428
Machine Vision Systems for Automated Weeding – Current Technologies and Future Directions. Mark C. Siemens*; University of Arizona, Yuma, AZ429
Precision Crop Protection: Soil Management Zones for Optimizing Weed Control Efficacy. Anita Dille*1, Garrison J. Gundy2; 1Kansas State University, Manhattan, KS, 2Valent U.S.A LLC, Seymour, IL430
The Advent of Autonomous Solutions in the Management of Weeds, and its Impact on the Use of Chemicals for Precision Agriculture. Wade Robey*; Raven Industries, Sioux Falls, SD431
Panel and Open Discussion. Steve Fennimore*; University of California, Davis, Salinas, CA432

ORAL - 01. AGRONOMIC CROPS

Herbicides for Industrial Hemp Grain Production. Joseph Mettler*, Kirk A. Howatt; North Dakota State University, Fargo, ND433
Common Ragweed (Ambrosia artemisiifolia) and Palmer Amaranth (Amaranthus palmeri) Control and Fecundity from POST Herbicides at Various Growth Stages with and without Fomesafen. Eric B. Scruggs*, Michael L. Flessner; Virginia Tech, Blacksburg, VA434
Herbicide Potential for Palmer Amaranth (Amaranthus palmeri) Control in Sugarbeet, Selectivity of Desmedipham and Phenmedipham. Clint W. Beiermann*1, Cody F. Creech1, Amit J. Jhala2, Stevan Knezevic3, Robert Harveson1, Nevin Lawrence1; 1University of Nebraska-Lincoln, Scottsbluff, NE, 2University of Nebraska-Lincoln, Lincoln, NE, 3University of Nebraska-Lincoln, Concord, NE435
Comparing Weed Communities of Perennial and Annual Small Grain Cropping Systems. Eugene P. Law*1, Matthew P. Spoth1, Sandra Wayman1, Christopher J. Pelzer1, Scott H. Morris1, Matthew R. Ryan1, Antonio DiTommaso2; 1Cornell University, Ithaca, NY, 2Cornell University, Dryden, NY436
Herbicide Efficacy on Threespike Goosegrass (Eleusine tristachya) in California Orchards. Drew A. Wolter*1, Brad Hanson2; 1University of California, Davis, Sacramento, CA, 2University of California, Davis, Winters, CA437
Trials and Tribulations with the Integrated Harrington Seed Destructor in Arkansas. Tom Barber*1, Thomas R. Butts1, Jason K. Norsworthy2; 1University of Arkansas System Division of Agriculture, Lonoke, AR, 2University of Arkansas, Fayetteville, AR438
Initial Impressions of the Seed TerminatorTM as a Harvest Weed Seed Control Tool After One Season of Evaluation in Missouri. Kevin W. Bradley*; University of Missouri, Columbia, MO439
Man vs Machine: Using Drone Aerial Imagery to Accurately Quantify Herbicide Tolerance. Eric N. Johnson, Christian J. Willenborg, Steve Shirtliffe*, Hemma Duddu; University of Saskatchewan, Saskatoon, SK, Canada440
The Role of Unintelligent Machines in Weed Management. Eric N. Johnson*, Steven J. Shirtliffe; University of Saskatchewan, Saskatoon, SK, Canada441
Integrating Gene Editing and Synthetic Biology to Develop Next-Generation Herbicide Resistant Crops. Lucas Lieber*; BIOHEURIS, St. Louis, MO442
Value of Weed Maps at Harvest in Wheat Cropping Systems of the PNW. Judit Barroso*1, Carolina San Martin Hernandez2, John D. McCallum3, Dan S. Long3; 1Oregon State University, Adams, OR, 2Oregon State University, Pendleton, OR, 3USDA-ARS, Adams, OR443

ORAL - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

Impacts of Indaziflam on Biodiversity of Intact Sage-brush Steppe Plant Communities. Jordan Meyer-Morey*, Lisa J. Rew, Jane Mangold; Montana State University, Bozeman, MT444
Management of Red Bromegrass (Bromus rubens) with Indaziflam and Other Pre-Emergent Herbicides. John H. Brock*; Arizona State University, Tempe, AZ445
Influence of Seeding Depth on Native Species Establishment in the Presence of Indaziflam. Jodie A. Crose*1, Brian Mealor2; 1University of Wyoming, Sheridan, WY, 2University of Wyoming, Laramie, WY446
Utilizing a Weed Risk Assessment for Listing State Noxious Weeds. Daniel R. Tekiela*; University of Wyoming, Laramie, WY447
Florpyrauxifen-benzyl: A Novel Auxin Herbicide for Aquatic Plant Management. Mirella F. Ortiz*, Franck E. Dayan; Colorado State University, Fort Collins, CO448
Management of Ventenata (Ventenata dubia) with Indaziflam at Different Preemergent Timings on Conservation Reserve Program Land. Jared A. Beuschlein*1, Rachel J. Zuger1, Timothy S. Prather2, Harold Quicke3, Ian Burke1; 1Washington State University, Pullman, WA, 2University of Idaho, Moscow, ID, 3Bayer, Windsor, CO449
Changes in Botanical Canopy Cover and Seasonal Forage Production with Herbicide Impregnated Dry Fertilizer. Scott Flynn*1, Byron B. Sleugh2, D Chad Cummings3, William L. Hatler4, David E. Hillger5; 1Corteva Agriscience, Lee's Summit, MO, 2Corteva Agriscience, Carmel, IN, 3Corteva Agriscience, Bonham, TX, 4Corteva Agriscience, Meridian, ID, 5Corteva Agriscience, Thorntown, IN450

3MT - 3MT PHD

The Effect of Common and Novel Pasture Herbicides on Forage Grass Establishment. Wykle C. Greene*, Michael L. Flessner; Virginia Tech, Blacksburg, VA451

ORAL - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

Growth Regulator Effects on Ventenata (Ventenata dubia) Seed Viability Under Field Conditions. Beth Fowers*1, Brian Mealor2, William L. Hatler3; 1University of Wyoming, Sheridan, WY, 2University of Wyoming, Laramie, WY, 3Corteva Agriscience, Meridian, ID452
Impacts of Simulated Trampling on Nonstructural Carbohydrates in Yellow-Flag Iris (Iris pseudacorus). Alexandra L. Stoneburner*; Colorado State University, Fort Collins, CO453
Long-term Outcome of Integrating Herbicide and Seeding in Leafy Spurge (Euphorbia esula)-Invaded Rangeland. Matthew J. Rinella1, Alan D. Knudsen2, Jim S. Jacobs3, Jane Mangold*4; 1USDA-ARS, Miles City, MT, 2Missoula County Weed District, Missoula, MT, 3NRCS, retired, Bozeman, MT, 4Montana State University, Bozeman, MT454

ORAL - 11. PHYSIOLOGY

Role of Epigenetics Modifications in the Development of Herbicide Resistance. Gourav Sharma*, Jacob Barney, Shawn Askew, James Westwood, David Haak, Suzanne Laliberte, Liqing Zhang; Virginia Tech, Blacksburg, VA455
A Characterization of Tissue Specific Alpha-Tubulin Gene Expression Two Grass Species, Annual Bluegrass (Poa annua) and Finger Millet (Eleusine coracana). Nathan D. Hall*, Jinesh D. Patel, Eli C. Russell, James Harris, Leslie R. Goertzen, Joseph S. McElroy; Auburn University, Auburn, AL456
Establishing a Basis for 2,4-D Tolerance in Red Clover (Trifolium pratense): RNA-seq Analysis of Susceptible and Tolerant Cultivars Following 2,4-D Application. Lucas Araujo*1, Michael Barrett1, Randy Dinkins2, Linda D. Williams1, Troy Bass2; 1University of Kentucky, Lexington, KY, 2USDA/FAPRU, Lexington, KY457
Mechanisms of 2,4-D Resistance in Palmer Amaranth. Wendy A. Peer*; University of Maryland, College Park, MD458
Investigation of Lactofen Resistance in a Population of Amaranthus palmeri. Jacob S. Montgomery*, Darci A. Giacomini, Patrick Tranel; University of Illinois, Urbana, IL459
Integrating UPLC-qTOF-MS and UPLC-MS/MS to Characterize Resistance to Bentazon in Chenopodium album L. Populations from Oregon. Lucas Baiochi Riboldi*, Ed Peachey, Andrew G. Hulting, Caio A. Brunharo; Oregon State University, Corvallis, OR460
QTL Discovery for Resistance to HPPD Inhibitors in Amaranthus tuberculatus. Brent P. Murphy*, Patrick Tranel; University of Illinois, Urbana, IL461
Modes of Action of Two Natural Herbicides in the Bioherbicide MBI-014. Stephen O. Duke*1, Franck E. Dayan2, Louis G. Boddy3, Zhiqiang Pan4, Joanna Basja-Hirschel4; 1University of Mississippi, Oxford, MS, 2Colorado State University, Fort Collins, CO, 3Marrone BIo Innovations, Davis, CA, 4USDA- ARS, Oxford, MS462
Resistance to a Non-Selective HPPD-Inhibiting Herbicide in Multiple-Resistant Waterhemp (Amaranthus tuberculatus) Populations. Jeanaflor Crystal Concepcion1, Sarah-Jane Hutchings2, James Morris2, Shiv S. Kaundun2, Anatoli V. Lygin1, Dean E. Riechers*1; 1University of Illinois, Urbana, IL, 2Syngenta, Bracknell, United Kingdom463
The Transcriptional Landscape of Glyphosate Resistance in Palmer Amaranth (Amaranthus palmeri): More Than EPSPS Gene Amplification. William T. Molin*1, Christopher A. Saski2; 1USDA-ARS, Stoneville, MS, 2Clemson University, Clemson, SC464
Progress in the Characterization of CYPs and GSTs Involved in Weed Resistance to Herbicides. Functional Validation. Roland S. Beffa*; Bayer AG, CropScience Division, Frankfurt, Germany465

ORAL - 13. INTEGRATED WEED MANAGEMENT

Multiple Modes of Selection Prove Successful in Managing Horseweed (Erigeron canadensis L.). Theodore R. Vanhie*1, Michael Cowbrough2, Clarence Swanton3, Francois Tardif1; 1University of Guelph, Guelph, ON, Canada, 2Ontario Ministry of Agriculture, Food and Rural Affairs, Guelph, ON, Canada, 3University of Guelph, Guelph, AZ, Canada466
Pollen Swamping Population Management Possibilities for Waterhemp (Amaranthus tuberculatus) Simulated in silico. Brendan C. Alexander*, Patrick Tranel, Aaron Hager, Nicolas F. Martin, Adam Davis; University of Illinois, Urbana, IL467
Unexpected Resistance Evolution to a Carotenoid Biosynthesis Inhibiting Herbicide in Field Selected Cross-Resistant Rigid Ryegrass (Lolium rigidum) Populations from Australia. David J. Brunton*1, Peter Boutsalis2, Gurjeet Gill2, Christopher Preston2; 1University of Adelaide, Adelaide, Australia, 2The University of Adelaide, Adelaide, Australia468
Present Status and Future Strategies for the Management of Herbicide Resistant Weeds of Wheat in India. Samunder Singh*; CCS HAU Hisar, Hisar, India469
Long-term Muti-tactic Herbicide Resistance Weed Management. Steven B. Mirsky*1, Lovreet S. Shergill2, Mark VanGessel3, Jason K. Norsworthy4, Adam Davis5; 1USDA-ARS, Beltsville, MD, 2USDA-ARS & University of Delaware, Beltsville, MD, 3University of Delaware, Georgetown, DE, 4University of Arkansas, Fayetteville, AR, 5University of Illinois, Urbana, IL470
The Western IPM Kochia Work Group: Update and Next Steps. Todd A. Gaines*1, Charles M. Geddes2, Philip Westra1, Kelly Bennett3, Cody F. Creech4, Rory Degenhardt5, Mithila Jugulam6, Rand Merchant7, Sarah Morran1, Olivia E. Todd1; 1Colorado State University, Fort Collins, CO, 2Agriculture and Agri-Food Canada, Lethbridge, AB, Canada, 3Corteva Agriscience Canada, Calgary, AB, Canada, 4University of Nebraska-Lincoln, Scottsbluff, NE, 5Affiliation Not Specified, Edmonton, AB, Canada, 6Kansas State University, Manhattan, KS, 7BASF, Greeley, CO471
Efficacy of Cotton and Peanut Residual Herbicides in High Residue Cover Crop System. Katilyn J. Price*, Steve Li, Frances B. Browne, Ryan D. Langemeier; Auburn University, Auburn, AL472
Impact of Four Winter Cover Crop Species and Termination Timing on Weed Suppression, Soil Moisture Dynamics, and Yield in Cotton. Spencer L. Samuelson*, Muthukumar V. Bagavathiannan; Texas A&M University, College Station, TX473
Using Living Mulch in Reduced Tillage Sweet Corn. Alan W. Leslie*, Veronica Yurchak, Cerruti R. Hooks; University of Maryland, College Park, MD474
Cover Crop-based Weed Management in Soybean Across mid-Atlantic, North-central, and South-central United States. Lovreet S. Shergill*1, Mark VanGessel2, Michael L. Flessner3, Muthukumar V. Bagavathiannan4, Kevin W. Bradley5, John Lindquist6, Jason A. Bond7, Lauren M. Lazaro8, Adam Davis9, Jason K. Norsworthy10, William S. Curran11, Wesley Everman12, George Frisvold13, Nicholas Jordan14, Larry Steckel15, Steven B. Mirsky16; 1USDA-ARS & University of Delaware, Beltsville, MD, 2University of Delaware, Georgetown, DE, 3Virginia Tech, Blacksburg, VA, 4Texas A&M University, College Station, TX, 5University of Missouri, Columbia, MO, 6University of Nebraska-Lincoln, Lincoln, NE, 7Mississippi State University, Stoneville, MS, 8Louisiana State University AgCenter, Baton Rouge, LA, 9University of Illinois, Urbana, IL, 10University of Arkansas, Fayetteville, AR, 11Penn State University, University Park, PA, 12North Carolina State University, Raleigh, NC, 13University of Arizona, Tucson, AZ, 14University of Minnesota, Saint Paul, MN, 15University of Tennessee, Jackson, TN, 16USDA-ARS, Beltsville, MD475
Evaluation of Post Emergence Applications of Mustard Seed Meal in Chile Pepper. Asmita Nagila*, Brian J. Schutte, Soum Sanogo, John Idowu; New Mexico state university, Las Cruces, NM476

ORAL - 01. AGRONOMIC CROPS

Sustaining the Utility of Herbicides in U.S. Agriculture: What Have We Learned and What is the Path Forward? Jason K. Norsworthy*1, Muthukumar V. Bagavathiannan2; 1University of Arkansas, Fayetteville, AR, 2Texas A&M University, College Station, TX477
Presence of Neighbouring Weeds Alters the Response of Maize to Thiamethoxam. Megan House1, Sasan Amirsadeghi2, Clarence Swanton*3, Lewis Lukens2; 1University of Saskatchewan, Saskatoon, SK, Canada, 2University of Guelph, Guelph, ON, Canada, 3University of Guelph, Guelph, AZ, Canada478
Italian Ryegrass (Lolium perenne Ssp. multiflorum) Timing of Removal Effects on Corn Growth and Yield in Mississippi. Michael T. Wesley Jr.1, J Connor Ferguson*1, Jason A. Bond2, Daniel B. Reynolds1, Erick J. Larson1; 1Mississippi State University, Mississippi State, MS, 2Mississippi State University, Stoneville, MS479
Optimizing the Use of Pyroxasulfone for Grass Weed Control in Cool-Season Grasses Grown for Seed. Andrew G. Hulting*, Kyle Roerig, Caio A. Brunharo, Carol Mallory-Smith; Oregon State University, Corvallis, OR480
Effect of Cereal Residual Herbicides on Faba Bean Planted the Following Season. Sid A. Darras*, Eric N. Johnson, Christian J. Willenborg; University of Saskatchewan, Saskatoon, SK, Canada481
Intercropping Winter Wheat into Forage Radish (Raphanus sativus). Michael L. Flessner*1, Kara Pittman1, Mark S. Reiter2, Eric B. Scruggs1, Kevin W. Bamber1; 1Virginia Tech, Blacksburg, VA, 2Virginia Tech, Painter, VA482
Helping Glufosinate Work in the West: Adjuvants, Rates, and Timings. Andrew R. Kniss*; University of Wyoming, Laramie, WY483
Preplant Burndown Weed Control with Elevore® Herbicide with Arylex™ Active. Joe Armstrong*1, Kristin Rosenbaum2, David Saunders3; 1Corteva Agriscience, Indianapolis, IN, 2Corteva Agriscience, Coffey, MO, 3Corteva Agriscience, Dallas Center, IA484
Introduction and Overview of MON 301107: A New Glyphosate Formulation. Christopher M. Mayo*1, Ross A. Recker2, David J. Mayonado3, Neha Rana4; 1Bayer, Gardner, KS, 2Bayer, Smithton, IL, 3Bayer, Hebron, MD, 4Bayer Crop Science, St Louis, MO485
The Bicyclopyrone Weed Control Advantage in a New Premix Product Concept for Corn. Ryan D. Lins*1, Tom H. Beckett2, Scott E. Cully3, Gordon D. Vail2, Dane L. Bowers2; 1Syngenta, Rochester, MN, 2Syngenta, Greensboro, NC, 3Syngenta, Marion, IL486
Triazine Benefits in Corn and Sorghum. Carroll Moseley*1, David Bridges2, Patricia D. Laird3; 1Syngenta, High Point, NC, 2Abraham Baldwin Agricultural College, Tifton, GA, 3Syngenta Crop Protection, Greensboro, NC487
Dimetric Charged: A New Option for Burndown and Residual Weed Control. Ryan J. Edwards*1, Gregory K. Dahl2; 1WinField United, River Falls, WV, 2WinField United, Eagan, MN488
Impact of Pre-Harvest Glyphosate on Oat (Avena sativa). Christian J. Willenborg*1, Eric N. Johnson1, Nancy Ames2; 1University of Saskatchewan, Saskatoon, SK, Canada, 2Agriculture and Agri-Food Canada, Winnpeg, MB, Canada489
Future of Academic Weed Science from Hemp to Students to Cancer. David D. Baltensperger*; Texas A&M University, College Ststion, TX490
Weed Management in Cotton as Influenced by Cover Crop and Herbicide Program. Pratap Devkota*, Ruby Tiwari, Prasanna Kharel, Michael J. Mulvaney; University of Florida, Jay, FL491
Florpyrauxifen-benzyl Sensitivity in Gossypium hirsutum, as Influenced by Application Placement. Ryan C. Doherty*1, Tom Barber2, Leah M. Collie3, Zachary T. Hill4; 1University of Arkansas Division of Agriculture Research & Extension, Monticello, AR, 2University of Arkansas System Division of Agriculture, Lonoke, AR, 3University of Arkansas System Division of Agriculture, Beebe, AR, 4University of Arkansas Cooperative Extension Service, Monticello, AR492
Kochia (Bassia scoparia) Control in Enlist™ Cotton (Gossypium hirsutum) Following Different Preplant Herbicide Options in the Texas High Plains. Ubaldo Torres*1, Peter A. Dotray2, Kyle R. Russell1, Michael Lovelace3; 1Texas Tech University, Lubbock, TX, 2Texas Tech University and Texas A&M AgriLife Research and Extension Service, Lubbock, TX, 3Corteva Agriscience, Lubbock, TX493
Use of Isoxaflutole as an Alternative Herbicide Site of Action in Cotton. Rodger B. Farr*1, Jason K. Norsworthy1, Tom Barber2, Grant L. Priess1, Mason C. Castner1; 1University of Arkansas, Fayetteville, AR, 2University of Arkansas System Division of Agriculture, Lonoke, AR494
Evaluating Tank Mix Partners with Isoxaflutole Across the Cotton Belt. Delaney C. Foster*1, Peter A. Dotray2, Seth A. Byrd3, A Stanley Culpepper4, Darrin M. Dodds5, Steven D. Hall6, Bradley J. Norris5, Reagan L. Noland7, Scott A. Nolte8, Mason T. House9, Jason K. Norsworthy10, Rodger B. Farr10, Larry Steckel11, Corey Thompson12; 1Texas Tech University, Lubbock, TX, 2Texas Tech University and Texas A&M AgriLife Research and Extension Service, Lubbock, TX, 3Oklahoma State University, Stillwater, OK, 4University of Georgia, Tifton, GA, 5Mississippi State University, Mississippi State, MS, 6Mississippi State University, Starkville, MS, 7Texas A&M Agrilife Extension Service, San Angelo, TX, 8Texas A&M AgriLife Extension, College Station, TX, 9Texas A&M University, College Station, TX, 10University of Arkansas, Fayetteville, AR, 11University of Tennessee, Jackson, TN, 12BASF, Abernathy, TX495
Safety of Pre- and Early-post Herbicides to Hemp for Seed Production. Angela R. Post*; North Carolina State University, Raleigh, NC496
Challenges and Opportunities for Weed Control in Popcorn. Ethann R. Barnes*1, Stevan Knezevic2, Nevin Lawrence3, Amit J. Jhala1; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Nebraska-Lincoln, Concord, NE, 3University of Nebraska-Lincoln, Scottsbluff, NE497
Utility of Two New Premix Concepts Containing Rinskor Active for Improved Efficacy and Weed Spectrum in MidSouth Rice Production. Drew Ellis*1, Larry C. Walton2, Hunter Perry3, Chris J. Meyer3, Jeff Ellis4, Mauricio Morell5; 1Corteva Agriscience, Arlington, TN, 2Corteva, Tupelo, MS, 3Corteva agriscience, Leland, MS, 4Dow AgroSciences, Sterlington, LA, 5Corteva Agriscience, Indianapolis, IN498
Efficacy and Crop Safety of RinskorTM Active (Florpyrauxifen-benzyl) in California Rice. Stephen F. Colbert*1, Mauricio Morell2; 1Corteva Agriscience, Escalon, CA, 2Corteva Agriscience, Indianapolis, IN499
Challenges of Weed Management in Rice Production in Canada. Kalidas Subedi*; Pest Management Center, Agriculture and Agri-Food Canada, Ottawa, ON, Canada500
Efficacy of Metamitron Applied PRE in the High Plains Sugar Beet Production Region. Andrew R. Kniss*; University of Wyoming, Laramie, WY501
Volunteer Corn Management with Fluazifop + Dicamba Tank Mixtures in Dicamba Tolerant Soybean. Marty Schraer*1, Peter Eure2, Thomas H. Beckett2, Marshall Hay3, Sudeep Matthew2, Ethan T. Parker3; 1Syngenta, Meridian, ID, 2Syngenta, Greensboro, NC, 3Syngenta, Vero Beach, FL502

ORAL - 03. TURF AND ORNAMENTALS

Crew Specialty Herbicide (Dithiopyr + Isoxaben): A New Herbicide for Broad-Spectrum Weed Control in Turf and Ornamentals. David E. Hillger*1, Amy L. Agi2, Paul Marquardt3; 1Corteva Agriscience, Thorntown, IN, 2Corteva Agriscience, Brooks, GA, 3Corteva Agriscience, Des Moines, IA503
Moisture Status Affects Efficacy of Foramsulfuron for Postemergence Goosegrass (Eleusine indica) Control. James Brosnan*1, Avat Shekoofa2, Matthew T. Elmore3, Jose J. Vargas1, Dan Tuck3, Greg Breeden1, Joaquin Simon2; 1University of Tennessee, Knoxville, TN, 2University of Tennessee, Jackson, TN, 3Rutgers University, New Brunswick, NJ504
Efficacy of Pinoxaden for Grass Control. Jeffrey Derr*; Virginia Tech, Virginia Beach, VA505
Frequent, Low-Dose Treatments for Weed Control on Putting Greens. John M. Peppers*, John Brewer, Shawn Askew; Virginia Tech, Blacksburg, VA506
Mitigating Creeping Bentgrass Phytotoxicity from Topramezone. Clebson G. Goncalves*1, John Brewer1, Joseph S. McElroy2, Shawn Askew1; 1Virginia Tech, Blacksburg, VA, 2Auburn University, Auburn, AL507
NativeKlean™ Herbicide (Aminopyralid + 2,4-D): A New Herbicide for Native Grass Roughs on Golf Courses. David E. Hillger*1, Amy L. Agi2, Paul Marquardt3; 1Corteva Agriscience, Thorntown, IN, 2Corteva Agriscience, Brooks, GA, 3Corteva Agriscience, Des Moines, IA508
Winter Slicing and Herbicides Affect Bermudagrass (Cynodon dactylon) Control in Creeping Bentgrass. Shawn Askew*, Jordan M. Craft, John Brewer; Virginia Tech, Blacksburg, VA509
Control of Bermudagrass (Cynodon dactylon) with Dazomet, Glyphosate, and Glyphosate Alternatives. Fred Yelverton*1, Patrick E. McCullough2, Travis Gannon1; 1North Carolina State University, Raleigh, NC, 2University of Georgia, Griffin, GA510
Consistent Efficacy and Defining the Use of ALS-Inhibiting Herbicides for Purple Nutsedge (Cyperus rotundus) Control in Turf. Kai Umeda*; University of Arizona, Phoenix, AZ511
Weed Management in Carbon Seeded Kentucky Bluegrass and Perennial Ryegrass. Raul Arroyo Rosas1, Tara L. Burke*2, Rachel J. Zuger1, Ian Burke1; 1Washington State University, Pullman, WA, 2Washington State University, Albion, WA512
Improving Tolerance of Pollinator-Serving Plants to Herbicides Using Band-Applied Charcoal. Shawn Askew*, Jordan M. Craft, Morgan Shock; Virginia Tech, Blacksburg, VA513
Evaluating Preemergent Herbicides for Use in Tropical Plants. Nathan Boyd1, Shawn T. Steed*2; 1University of Florida, Balm, FL, 2University of Florida, Seffner, FL514

ORAL - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

Long-term Downy Brome (Bromus tectorum) Seedling Reduction with Indaziflam in Sagebrush-Grassland Plant Communities in Sublette County, WY US. Jake Courkamp*; Colorado State University, Fort Collins, CO515
Ecosystem Response to Thirteen Operational Indaziflam Cheatgrass (Bromus tectorum) Treatments. James Sebastian*1, Steve Sauer1, Shannon Clark2, Derek J. Sebastian3; 1Boulder County Open Space, Longmont, CO, 2Colorado State University, Fort Collins, CO, 3Bayer, Greeley, CO516
Evaluating the Efficacy of Various Herbicides for Bulbous Bluegrass (Poa bulbosa) Control. Jordan L. Skovgard*1, Brian Mealor2; 1University of Wyoming, Laramie, WY, 2UNIVERSITY OF WYOMING DEPT OF PLANT SCI, Laramie, WY517
Restoration of Invasive Annual Grass Degraded Landscapes: Overview of the Indaziflam Field Trial Program. Harold Quicke*1, John H. Brock2, Ian Burke3, Shannon Clark4, Thomas J. Getts5, Jane Mangold6, Brian Mealor7, Scott J. Nissen4, Timothy S. Prather8, Corey V. Ransom9, Derek J. Sebastian10, Stephen M. Van Vleet11; 1Bayer, Windsor, CO, 2Arizona State University, Tempe, AZ, 3Washington State University, Pullman, WA, 4Colorado State University, Fort Collins, CO, 5University of California Cooperative Extension, Susanville, CA, 6Montana State University, Bozeman, MT, 7University of Wyoming, Laramie, WY, 8University of Idaho, Moscow, ID, 9Utah State University, Logan, UT, 10Bayer, Greeley, CO, 11Washington State University, Colfax, WA518
Developing Chemical Control Strategies for the Invasive Weed Oblong Spurge, Euphorbia oblongata.. Scott Oneto*; University of California Cooperative Extension, Jackson, CA519
Southern Sandbur (Cenchrus echinatus) Control in Bermudagrass Pasture with Indaziflam. Jason Belcher*1, Tyler Monday2; 1Bayer, Auburn, AL, 2Auburn University, Auburn, AL520
Collaboratively Addressing the Wilding Invasive Pine Issue Across East Maui - Part 1. Alison C. Cohan*1, Caleb Wittenmyer1, Jeffrey Mallinson2; 1The Nature Conservancy of Hawaii, Makawao, HI, 2Haleakala National Park, Makawao, HI521
Collaboratively Addressing the Wilding Invasive Pine Issue Across East Maui - Part 2. Alison C. Cohan1, Jeffrey Mallinson*2; 1The Nature Conservancy of Hawaii, Makawao, HI, 2Haleakala National Park, Makawao, HI522
Automatic Detection of Invasive Weeds in Hawaii Using High Resolution Imagery and Machine Learning. Ryan L. Perroy*1, Roberto Rodriguez2, Travis Mandel1, Pat Perez1, David Benitez3, James J. Leary4; 1University of Hawaii at Hilo, Hilo, HI, 2USDA, Edinberg, TX, 3National Park Service, Volcano, HI, 4Department of Agronomy, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL523
Herbicide Trials with Brazilian Egeria (Egeria densa) for Management in the Sacramento / San Joaquin River Delta. John D. Madsen*; USDA-ARS, Davis, CA524
Use of Machine Learning to Automate Aquatic Plant Identification from Sensing Technologies. Robert J. Richardson*1, Maharshi Patel1, Andrew Howell2, Shaphan Jernigan1, Scott Ferguson1, Greg Buckner1; 1North Carolina State University, Raleigh, NC, 2North Carolina State University, Sanford, NC525
Economics and Efficacy of Japanese Stiltgrass (Microstegium vimineum) Control After Nine Years of Treatments in a Forest Understory. John Brewer*1, Becky Fletcher1, Daniel R. Tekiela2, Angela R. Post3, Gourav Sharma1, Vasiliy Lakoba1, Jacob Barney1, Shawn Askew1; 1Virginia Tech, Blacksburg, VA, 2University of Wyoming, Laramie, WY, 3North Carolina State University, Raleigh, NC526
Effect of Spatial Extent on the Performance of Six Forest Invasive Plant Habitat Suitability Models in Wisconsin. Niels A. Jorgensen, Mark J. Renz*; University of Wisconsin-Madison, Madison, WV527

ORAL - 10. BIOCONTROL OF WEEDS

Impacts of Weed Biocontrol in Hawaii. M Tracy Johnson*; USDA Forest Service, Volcano, HI528
Mechanisms of Weed Seed Predation and its Potential Role in Weed Biocontrol. Khaldoun Ali*; University of Saskatchewan, Saskatoon, SK, Canada529
Identification of a Potential Allelopathic Substance Involved in Allelopathic Activity of False Mangosteen (Garcinia xanthochymus). Md Mahfuzur Rob*1, Keitaro Iwasaki2, Arihiro Iwasaki2, Kiyotake Suenaga2, Hisashi Kato-Noguchi1; 1Kagawa University, Miki, Japan, 2Keio University, Yokohama, Japan530
Inhibiting Herbicide Resistant Amaranthus by Suppressing Reproduction. Efrat Lidor Nili1, Ido Shwartz1, Herve Huet1, Miriam Aminia1, Micheal D. Owen2, Jonathan Gressel3, Orly Noivirt-Brik*1; 1WeedOUT Ltd., Ness Ziona, Israel, 2Iowa State University, Ames, IA, 3Affiliation Not Specified, Rehovot, Israel531
Penology of Dioscorea bulbifera and its Co-evolved Natural-enemy Lilioceris cheni: Implication in Biological Control Efficacy in Florida. Min B. Rayamajhi*; USDA/ARS Invasive Plant Res Lab, Fort Lauderdale, FL532
Developing a Microbial Herbicide to Control Amaranthus Weeds. Louis G. Boddy*, Tim Johnson; Marrone BIo Innovations, Davis, CA533
Progress on Classical Biological Control of Cogongrass (Imperata cylindrica) in the Southeastern United States. James P. Cuda*1, Purnama Hidayat2, Izza A. Putri2; 1University of Florida, Gainesville, FL, 2Bogor Agricultural University, Bogor, Indonesia534

ORAL - 13. INTEGRATED WEED MANAGEMENT

Manipulating Cropping Systems to Create a Better Harvest Weed Seed Control Target in Wild Oat (Avena fatua). Breanne D. Tidemann*1, Larry Michielsen1, Patty Reid1, Jennifer Zuidhof1, Elizabeth Sroka1, Hiroshi Kubota1, K. Neil Harker2, Robert Gulden3, Rebecca Dueck4, Alick Mulenga5, Cindy Gampe5, Greg Semach6; 1Agriculture and Agri-Food Canada, Lacombe, AB, Canada, 2Agriculture and Agri-Food Canada (retired), Lacombe, AB, Canada, 3University of Manitoba, Winnipeg, Canada, 4University of Manitoba, Winnipeg, MB, Canada, 5Agriculture and Agri-Food Canada, Scott, SK, Canada, 6Agriculture and Agri-Food Canada, Beaverlodge, AB, Canada535
The Weed Chipper: a Site-Specific Non-Chemical Weed Control Option for Conservation Cropping Systems. Andrew L. Guzzomi*1, Michael J. Walsh2; 1University of Western Australia, Crawley, Australia, 2University of Sydney, Sydney, Australia536
Nozzle Type and Arrangement Effect on Spray Coverage. Ashley N. McCormick*1, Landon G. Smith1, Troy W. Dillon2, Thomas R. Butts2, Brad M. Davis2, Leah M. Collie3; 1University of Arkansas System Division of Agriculture, Newport, AR, 2University of Arkansas System Division of Agriculture, Lonoke, AR, 3University of Arkansas System Division of Agriculture, Beebe, AR537
Continuing Evolution of Impact Mill Systems for Harvest Weed Seed Control. Michael J. Walsh*1, John C. Broster2; 1University of Sydney, Sydney, Australia, 2Charles Sturt University, Wagga Wagga, Australia538
Weed-Sensing Technology Reworks Fallow Management of Rush Skeletonweed (Chondrilla juncea L.). Jacob W. Fischer*, Mark Thorne, Drew J. Lyon; Washington State University, Pullman, WA539
Advances in Precision Weed Management 2020. Vijay Singh*1, Daniel Martin2, Mohamed Latheef2, Bishwa B. Sapkota3, Muthukumar V. Bagavathiannan3; 1Virginia Tech, Painter, VA, 2United States Department of Agriculture, College Station, TX, 3Texas A&M university, College Station, TX540
Effects of Cover Crops on Nutrient Dynamics and Weed Communities. Karla L. Gage*1, Rachel Cook2, Randy McElroy3, Gurbir Singh1, Jon Schoonover1, Karl Williard1; 1Southern Illinois University Carbondale, Carbondale, IL, 2North Carolina State University, Raleigh, NC, 3Bayer Crop Science, Farina, IL541
Cover Crop Planting Date and Weed Emergence in Almond Orchards. Steven C. Haring*1, Brad Hanson2; 1University of California, Davis, Davis, CA, 2University of California, Davis, Winters, CA542
Seasonal Variability in Pre-harvest Seed-dispersal in Hordeum glaucum (Smooth Barley) and Bromus diandrus (Ripgut Brome) – Implications for Harvest Weed Seed Control. Daniel Petersen, Gurjeet S. Gill*; University of Adelaide, Adelaide, Australia543
Evaluation of Rate and Timing of Herbicide Application During the Establishment of a Living White Clover (Trifolium repens) Mulch for Field Corn Production. Nicholas T. Basinger*, Nicholas S. Hill; University of Georgia, Athens, GA544
Soybean Response to Sublethal Dosages of Dicamba Particle Drift Vs. Vapor. Frances B. Browne1, Steve Li*1, Katilyn J. Price1, Ryan D. Langemeier1, Greg R. Kruger2; 1Auburn University, Auburn, AL, 2University of Nebraska-Lincoln, North Platte, NE545
Driver Weeds and the Balance of Control Option Space. Anita Kuepper*1, Frank Rothweiler2, Tracy Klingaman2, Hubert Menne3, Philipp Welter4, Catherine de Vulder4; 1Bayer Cropscience, Frankfurt, Germany, 2Bayer AG, St. Louis, MO, 3Bayer AG Crop Science, Frankfurt, Germany, 4Bayer AG, Monheim, Germany546
Annual Bluegrass Management in Cool-Season Grasses Grown for Seed in Oregon: A Meta-Analysis of Multiple Years of Internal Data. Seth Bernard E. Abugho*, Caio A. Brunharo, Andrew G. Hulting; Oregon State University, Corvallis, OR547

ORAL - 14. TRAVEL ENRICHMENT EXPERIENCE

Tackling Toadflax in Montana. Jessica E. Quinn*; University of Guelph, Ridgetown, ON, Canada548
From Inception to Market: Learning the Herbicide Registration Cycle with Syngenta. John A. Schramski*1, Carroll Moseley2, Janis E. McFarland3; 1Michigan State University, East Lansing, MI, 2Syngenta, High Point, NC, 3Affiliation Not Specified, Chapel Hill, NC549
A Week in the West - My 2019 Travel Enrichment Experience with Syngenta. Nicholas R. Steppig*; Purdue University, Lafayette, IN550
Agriculture Beyond Borders: Tifton to Saskatoon. Kayla M. Eason*; University of Georgia, Tifton, GA551
Specialty Weeds at Commodity Scale; California's Central Valley. Samuel A. Palmer*; University of New Hampshire, Epsom, NH552
The Intersection of Weed Science and Politics: What I Learned During My Fellowship in DC. Haleigh Summers*1, John A. Schramski2, Lee Van Wychen3; 1Weed Science Society of America, Ames, IA, 2Michigan State University, East Lansing, MI, 3Weed Science Society of America, Alexandria, VA553

SYMPOSIUM - 5. TOXICOLOGY AND WEED SCIENCE

Introduction to Symposium. Scott Senseman*; The University of Tennessee, Knoxville, TN554
Risk Assessment and Management Review. Michael A. Hayoun*; University of California, Davis, Sacramento, CA555
Data and Discernment: Glyphosate as a Case Study. Bernalyn McGaughey*; Compliance Services International, Lakewood, WA556
The Glyphosate Issue: a Poor Man's Toxicology Viewpoint. Scott Senseman*; The University of Tennessee, Knoxville, TN557
How the Court System Handles Scientific Data and How an Expert Witness Presents Data in Court. Philip A. Banks*; Marathon-Agricultural & Environmental Consulting, Inc., Las Cruces, NM558
Getting and Staying Out of the Weeds When it Comes to Effectively Communicating Science. Norman Hammitt*; South College, Knoxville, TN559
Media Training Demonstration and Discussion. Scott Senseman*; The University of Tennessee, Knoxville, TN560
Group Panel Discussion. Scott Senseman*; The University of Tennessee, Knoxville, TN561

ORAL - 01. AGRONOMIC CROPS

Tirexor (Trifludimoxazin): Next Generation Burndown Update - US. Douglas Findley*1, Cletus C. Youmans2, Steven Bowe3; 1BASF, Rolesville, NC, 2BASF, Dyersburg, TN, 3BASF, Research Triangle Park, NC562
Tirexor® a New (PPO) Herbicide to Manage Weed Resistance in Argentina. Teofilo Bustingorri*; BASF Argentina SA, Buenos Aires, Argentina563
Tirexor Herbicide: Tirexor + Kixor for Pre-seed Burndown Weed Control in Cereals and Pulse Crops in Western Canada. . Mark Oostlander*1, Ethan Bertholet2, Lyle Drew2, Brittany Hedges1, Brendan Metzger3; 1BASF, Calgary, AB, Canada, 2BASF, Saskatoon, SK, Canada, 3BASF, Winkler, MB, Canada564
Luximo – A Soil Active Residual Herbicide as a Novel Resistance Management Tool. Helmut Kraus*1, Stuart J. Kevis2, Giuseppe Allegretta3, Laurent Picard3, Ulrike Anders3, Sascha Schlaefer3, Sudhakar Kandru4, Andreas Landes3, Gerd Kraemer3, Bernd Sievernich5, Ruth Campe3, Ian Francis6; 1BASF Corporation, Durham, NC, 2BASF Plc, Bury St. Edmunds, United Kingdom, 3BASF SE, Limburgerhof, Germany, 4BASF South East Asia Pte. Ltd., Singapore, Singapore, 5BASF SE, Limburgehof, Germany, 6BASF Australia, Tamworth, Australia565
Introducing Luximo - A New Dawn for Black-grass Control in the UK. Stuart J. Kevis*; BASF Plc, Bury St. Edmunds, United Kingdom566
Luximo: A New Mode of Action (MOA) Pre-emergence Herbicide for the Control of Annual Ryegrass (Lolium rigidum Gaud.) and Other Monocotyledon Weeds in Cereals in Australia. Ian Francis*; BASF Australia, Tamworth, Australia567
Weed Control in Dicamba-Tolerant Soybean in Southwest North Dakota. Caleb D. Dalley*, Daniel Guimaraes Abe; North Dakota State University, Hettinger, ND568
Evaluating Weed Control and Crop Safety of a Premix of Dicamba and Pyroxasulfone in Dicamba-resistant Soybean in Nebraska. Ethann R. Barnes*1, Brady Kappler2, Amit J. Jhala1; 1University of Nebraska-Lincoln, Lincoln, NE, 2BASF, Eagle, NE569
Guayule (Parthenium argentatum) Response to Preemergence Herbicides. William B. McCloskey*1, Guangyauo Sam Wang2, Bryan C. Pastor1; 1University of Arizona, Tucson, AZ, 2Bridgestone Americas, Inc, Eloy, AZ570
Field Assessment of Flax Tolerance to Preemergence and Postemergence Herbicides. Caleb D. Dalley1, Brian Jenks2, Daniel Guimaraes Abe*1; 1North Dakota State University, Hettinger, ND, 2North Dakota State University, Minot, ND571
Plantain (Plantago Ianceolata L.), in Red Clover (Trifolium pratense L.) Grown for Seed. Kyle Roerig*, Andrew G. Hulting; Oregon State University, Corvallis, OR572

ORAL - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

MezaVue Herbicide: Pricklypear Control and Beyond. D Chad Cummings*1, Byron B. Sleugh2, William L. Hatler3, Scott Flynn4, Charles Hart5, James R. Jackson6; 1Corteva Agriscience, Bonham, TX, 2Corteva Agriscience, Carmel, IN, 3Corteva Agriscience, Meridian, ID, 4Corteva Agriscience, Lee's Summit, MO, 5Dow AgroSciences, Stephenville, TX, 6Texas A&M AgriLife Extension, Stephenville, TX573
Rinksor + Aminopyralid (TerraVue): A New Herbicide for Noncrop Land Management. Byron B. Sleugh1, William L. Hatler*2, Scott Flynn3, D Chad Cummings4; 1Corteva AgriScience, Carmel, IN, 2Corteva Agriscience, Meridian, ID, 3Corteva Agriscience, Lee's Summit, MO, 4Corteva Agriscience, Bonham, TX574
Can I Keep My Clover? Rinskor Active: A New Herbicide Enabling Selective Broadleaf Weed Control in White Clover-Grass Pastures. Byron B. Sleugh*1, Scott Flynn2, D Chad Cummings3, William L. Hatler4, David E. Hillger5; 1Corteva Agriscience, Carmel, IN, 2Corteva Agriscience, Lee's Summit, MO, 3Corteva Agriscience, Bonham, TX, 4Corteva Agriscience, Meridian, ID, 5Corteva Agriscience, Thorntown, IN575
Rinskor + Aminopyralid (Duracor) - A New Herbicide for Control of Weeds in Rangeland and Pastures. Scott Flynn*1, Byron B. Sleugh2, William L. Hatler3, D Chad Cummings4, David E. Hillger5; 1Corteva Agriscience, Lee's Summit, MO, 2Corteva Agriscience, Carmel, IN, 3Corteva Agriscience, Meridian, ID, 4Corteva Agriscience, Bonham, TX, 5Corteva Agriscience, Thorntown, IN576
Control of Key Rangeland Noxious and Invasive Weeds with Rinskor + Aminopyralid in the Western U.S. William L. Hatler*1, Scott Flynn2, Byron B. Sleugh3, D Chad Cummings4, David E. Hillger5; 1Corteva Agriscience, Meridian, ID, 2Corteva Agriscience, Lee's Summit, MO, 3Corteva Agriscience, Carmel, IN, 4Corteva Agriscience, Bonham, TX, 5Corteva Agriscience, Thorntown, IN577
Desirable Forb Tolerance to Applications of Rinskor Containing Herbicides in Rangeland and Pastures. D Chad Cummings*1, Byron B. Sleugh2, William L. Hatler3; 1Corteva Agriscience, Bonham, TX, 2Corteva Agriscience, Carmel, IN, 3Corteva Agriscience, Meridian, ID578

POSTER - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

Weed Control Spectrum of a Novel Herbicide, Florpyrauxifen-benzyl, for Pastures and Hayfields. Wykle C. Greene*, Michael L. Flessner; Virginia Tech, Blacksburg, VA579

ORAL - 04. PASTURE, RANGE, FOREST, RIGHTS OF WAYS & NATURAL AREAS

Documenting the Impact of Training Municipalities to Control Invasive Plants on Wisconsin Roads. Mark J. Renz*, Leo Roth, Anne Pearce; University of Wisconsin-Madison, Madison, WV580
Evaluating the Effectiveness of Hexazinone on Brunswickgrass in Bahiagrass Seed Production Fields. Clay T. Cooper*1, Brent A. Sellers2; 1University of Florida Extension, Lecanto, FL, 2University of Florida, Ona, FL581
Smutgrass Response to Hexazinone Using Different Application Techniques. Brent A. Sellers*1, José Luiz Carvalho de Souza Dias2; 1University of Florida, Ona, FL, 2University of Wisconsin-Madison, Madison, WV582

ORAL - 08. FORMULATION, ADJUVANT, & APPLICATION TECHNOLOGY

Assessment of Commercial Scale Dicamba and 2,4-D Drift Using Drift Reducing Adjuvants. Ryan J. Edwards*1, Lillian C. Magidow1, Steven A. Fredricks1, Gregory K. Dahl2; 1WinField United, River Falls, WV, 2WinField United, Eagan, MN583
Survey of Commercial Sprayers in Alabama for Dicamba Residue Retention Following Triple Rinse with Water. Frances B. Browne*, Steve Li, Katilyn J. Price; Auburn University, Auburn, AL584
Fatty Acid Methyl Ester Ethoxylates: A New Surfactant and Adjuvant for Crop Protection. Dean Oester*1, Timothy H. Anderson2; 1BASF, Cincinnati, OH, 2BASF Corporation, Cincinnati, OH585
Evaluating Weed Control Efficacy of Dicamba and Dicamba/tembotrione with and without Ammonium Sulfate in Corn in the Midwest. Ethann R. Barnes1, Brian Dintelmann2, Kevin W. Bradley2, Aaron Hager3, Amit J. Jhala*1; 1University of Nebraska-Lincoln, Lincoln, NE, 2University of Missouri, Columbia, MO, 3University of Illinois, Urbana, IL586
Efficacy of Three New Adjuvant Formulations on Herbicide Performance Across the Mid-Western United States. Jim T. Daniel*1, Tom Hoverstad2, Paul O. Johnson3, Scott Parrish4, Bruce Potter5, Prashant Jha6, Philip Westra7; 1Daniel Ag Consulting, Keenesburg, CO, 2University of Minnesota Southern Research and Outreach Center, Waseca, MN, 3South Dakota State University, Brookings, SD, 4AGRASYST, Spokane, WA, 5University of Minnesota Southwest Research and Outreach Center, Lamberton, MN, 6Iowa State University, Ames, IA, 7Colorado State University, Fort Collins, CO587
Plant Macro- and Micronutrients Formulated as Effective Environmentally Benign Postemergence Herbicides. David A. Cobb*; Belvedere Foliar LLC, Belvedere, CA588
Quizalofop-P-Ethyl: Adjuvants, Nitrogen Fertilizer, and Tank-mixtures - the Rest of the Story. Richard K. Zollinger*1, Peter J. Porpiglia2, Mark L. Bernards3, Jerry M. Green4, Kirk A. Howatt5, Prashant Jha6, Greg R. Kruger7, Christy Sprague8, Mark VanGessel9, Bryan G. Young10; 1Amvac Chemical Company, Spokane, WA, 2Amvac Chemical Company, Newport Beach, CA, 3Western Illinois University, Macomb, IL, 4Green Ways Consulting LLC, Landenberg, PA, 5North Dakota State University, Fargo, ND, 6Iowa State University, Ames, IA, 7University of Nebraska-Lincoln, North Platte, NE, 8Michigan State University, East Lansing, MI, 9University of Delaware, Georgetown, DE, 10Purdue University, Brookston, IN589
Shear Stabilization of High Molecular Weight Drift Control Polymers. Timothy H. Anderson*1, Dean Oester2, Melvin Long1; 1BASF Corporation, Cincinnati, OH, 2BASF, Cincinnati, OH590
Mirror, Mirror on the Wall: What's the Best Adjuvant of Them All. Joe V. Gednalske1, Gary Halvorson*2; 1Council of Producers & Distributors of Agrotechnology, Washington, DC, 2Council of Producers and Distributors of Agrotechnology, Washington, DC591
The Influence of Adjuvants and Tank-Mix Products on the Performance of New Dicamba and 2,4-D Herbicides. Gregory K. Dahl*1, Ryan J. Edwards2, Lillian C. Magidow2, Annie Makepeace2, Joshua J. Skelton3, Steven A. Fredericks2, Andrea C, Clark2; 1WinField United, Eagan, MN, 2WinField United, River Falls, WV, 3WinField United, Saint Paul, MN592
Optimizing the Oxford P15 for Droplet Spectrum Measurement and Spray Analysis in the Field and Laboratory. J Connor Ferguson*1, Justin S. Calhoun2, Kayla L. Broster1, Zachary R. Treadway1, Zaim Ugljic1; 1Mississippi State University, Mississippi State, MS, 2Mississippi State University, Starkville, MS593
The Effect of pH Modifying Adjuvants on Efficacy of Glyphosate + Dicamba Tank-Mixes. Joseph T. Ikley*1, Mike Ostlie2, Nathan H. Haugrud1, Nicholas R. Steppig3, Bryan G. Young4; 1North Dakota State University, Fargo, ND, 2North Dakota State University, Carrington, ND, 3Purdue University, Lafayette, IN, 4Purdue University, Brookston, IN594
On-Farm Evaluations of Auxin Nozzles for Peanut Pest Management - Year 2. Eric P. Prostko*1, Mark R. Abney1, Robert C. Kemerait1, Glen C. Rains1, D. Scott Carlson2, James L. Jacobs3, D. Bryce Sutherland2, William G. Tyson4; 1University of Georgia, Tifton, GA, 2University of Georgia Extension, Sylvester, GA, 3University of Georgia Extension, Blackshear, GA, 4University of Georgia Extension, Statesboro, GA595

ORAL - 09. WEED BIOLOGY AND ECOLOGY

Unequal Crossover in Heterochromatin Rich Region of a Chromosome Drives Amplification of ACC-ase Gene and Sethoxydim Resistance in Large Crabgrass. Mithila Jugulam*1, Dal-Hoe Koo1, Sushila Chaudhari1, Martin Laforest2, Brahim Soufiane2, Bernd Friebe1, Bikram S. Gill1; 1Kansas State University, Manhattan, KS, 2AAC-AAFC, St-jean-sur-richelieu, QC, Canada596
A Novel Invasive Annual Grass in North American Interior Ecosystems: Ventenata dubia (North Africa Grass). Becky K. Kerns*1, Claire Tortorelli2, Ty C. Nietupski2, Michelle A. Day3, Meg Krawchuk2, Bridgett Naylor4, John Kim1; 1US Forest Service - PNW Research Station, Corvallis, OR, 2Oregon State University, Corvallis, OR, 3US Forest Service - Rocky Mountain Research Station, Corvallis, OR, 4US Forest Service - PNW Research Station, La Grande, OR597
Efficacy of Crop Rotation, Tillage and Herbicide for Long-Term Herbicide-Resistant Kochia (Bassia scoparia) Management. Elizabeth G. Mosqueda*1, Andrew R. Kniss2, Nevin Lawrence3, Prashant Jha4, Charlemagne A. Lim5; 1California State University-Monterey Bay, Marina, CA, 2University of Wyoming, Laramie, WY, 3University of Nebraska-Lincoln, Scottsbluff, NE, 4Iowa State University, Ames, IA, 5Montana State University, Huntley, MT598
Population Genomics of Italian Ryegrass (Lolium perenne L. spp. multiflorum) with Diverse Herbicide Resistance Patterns: a RAD-Seq Approach. Caio A. Brunharo*, Andrew G. Hulting; Oregon State University, Corvallis, OR599
Herbicide Resistance Survey in Winter Wheat Cropping Systems Identifies the First Secale cereale Imazamox-Resistant Population. Neeta Soni*, Eric P. Westra, Philip Westra, Todd A. Gaines; Colorado State University, Fort Collins, CO600
Weed Biology Insights to Improve Management of Chloris virgata. Bhagirath S. Chauhan*; University of Queensland, Gatton, Australia601
Maternal Water Stress Influences Progeny Characteristics and Management in Palmer Amaranth. O. Adewale Osipitan*1, Maor Matzrafi2, Sara Ohadi1, Mohsen B. Mesgaran1; 1University of California, Davis, Davis, CA, 2Newe Ya'ar Research Center, Department of Weed Research and Plant Pathology, Agricultural Research Organization, Ramat Yishai, Israel602
Salt Stress and Recurrent Herbicide Application May Speed the Evolution of Jungle Rice Resistant to Imidazolinones. Lariza Benedetti1, Nilda Roma-Burgos2, Luis A. Avila*1, Gustavo M. Souza1; 1Universidade Federal de Pelotas, Pelotas, Brazil, 2University of Arkansas, Fayetteville, AR603
Burial Depth and Flooding Effects on Emergence of Five California Weedy Rice (Oryza sativa f. spontaneae Rosh.) Accessions. Liberty B. Galvin*1, Mohsen B. Mesgaran1, Whitney Brim-DeForest2, Kassim Al-Khatib1; 1University of California, Davis, Davis, CA, 2University of California Division of Agriculture and Natural Resources, Yuba City, CA604
Exposure to Dicamba Influences Sex-Ratio in Palmer Amaranth (Amaranthus palmeri). Debalin Sarangi*1, Aniruddha Maity2, Nithya K. Subramanian2, Muthukumar V. Bagavathiannan2; 1University of Wyoming, Powell, WY, 2Texas A&M University, College Station, TX605
High Trait Variations Within and Among the Transcontinental Populations of a Global Invader: Anthemis cotula L. (Mayweed Chamomile). Subodh Adhikari*1, Ian Burke2, Sanford Eigenbrode1; 1University of Idaho, Moscow, ID, 2Washington State University, Pullman, WA606
Impacts of Drought and Native Grass Competition on Buffelgrass (Pennisetum ciliare): Opportunities for Active Restoration. Hannah Lucia Farrell*, Elise S. Gornish; University of Arizona, Tucson, AZ607
Structural Characterization of Phytotoxic Compounds from Lantana camara.. Dr. Tauseef Anwar*, Huma Qureshi; PIR MEHR ALI SHAH ARID AGRICULTURE UNIVERSITY, Rawalpindi, Pakistan608

WORKSHOP - BUILDING A COMMUNITY TO BATTLE THE WICKED PROBLEM OF HERBICIDE RESISTANCE

Building Communities to Battle the Wicked Problem of Herbicide Resistance. David R. Shaw*1, Jill Schroeder2, Michael Barrett3, David E. Ervin4, George Frisvold5, Amy Asmus6, Susan M. Koehler7, Ian Burke8, Mark VanGessel9, Clint D. Pilcher10, A Stanley Culpepper11, Katherine Dentzman12, Addie Mayfield1, Jesaelyn Gizotti de Moraes13; 1Mississippi State University, Mississippi State, MS, 2New Mexico State University, Las Cruces, NM, 3University of Kentucky, Lexington, KY, 4Portland State University, Portland, OR, 5University of Arizona, Tucson, AZ, 6Asmus Farm Supply, Inc, Rake, IA, 7USDA-APHIS, Columbia, MD, 8Washington State University, Pullman, WA, 9University of Delaware, Georgetown, DE, 10Corteva AgriScience, Johnston City, IA, 11University of Georgia, Tifton, GA, 12University of Idaho, Moscow, ID, 13University of Nebraska-Lincoln, West Platte, NE609