Resources
Herbicides
List of Herbicides
Information for Submitting New Herbicide Site of Action/Classification
Chemical Structures
Herbicide MOA Classification Master List with Molecular Structures (January 2026)
Click here to download a zipped file (880KB) with all structures in wmf format. These structures have been provided by Bill Ahrens. They may be used for educational uses. *Please note that these resources are provided for reference only, and no age information is associated with the structures.
Additional Resources
Photography of Herbicide Effects on Plants
These time-lapse photography videos show the effects of various herbicides on plants. The videos were originally prepared by Larry Burrill and Jerry Hill at Oregon State University and were further modified for digital format and made available for public use by D. R. Pike.
This information is copyrighted and may not be reproduced without the express permission of Oregon State University. For full video and information contact Oregon State University.
The movies are in AVI format, and will require a video player, such as Microsoft Windows Media Player, or similar.
- 2,4-D on Tomato (4.7M)
- Clopyralid on Canada Thistle (4.6M)
- Paraquat on Bean (5.7M)
- Paraquat on Corn (4.6M)
- Fluazifop-butyl on Soybean and Oat (5.2M)
- Fluazifop-butyl on Cotton and Johnsongrass (5.0M)
- Sethoxydin on Soybean and Oat (5.0M)
- Diclofop-methyl on Wheat and Oat (4.8M)
- Glyphosate on Cowpea (5.0M)
- Glyphosate on Barley and Oat (5.2M)
- Atrazine on Cocklebur (4.2M)
- Chlorsulfuron on Sugarbeet (3.8M)
- Chlorimuron-ethyl on Soybean and Cocklebur (5.1M)
- Atrazine on Oat (4.9M)
- Trifluralin on Oat Roots (5.4M)
- Metolachlor on Oat (5.0M)