Weed science Society of America Logo


WSSA Pesticide Stewardship Series 04- The Importance of Reading the Pesticide Label

A person applying a pesticide to their land was recently fined for spray drift that damaged desirable shrubs and garden crops on a neighboring property. In two other recent cases, individuals were fined for improper pesticide storage and illegal disposal of pesticide containers. Each of these cases had one thing in common: a failure to follow the pesticide label.

“The pesticide label is not something you can glance through or read once and commit to memory,” says Jack Peterson, associate director, Environmental Services Division, Arizona Department of Agriculture. “It is a legal document, and any use inconsistent with the label is a federal and state offense.”

There are countless good reasons for reading and following the label and having it immediately accessible. Here are some of the unfortunate (and illegal) consequences that can happen when you don’t:

  1. You may apply the wrong product…or the right product at the wrong rate. Various brands and packaging can look similar, but the products may be very different – containing different active ingredients or concentrations. Make sure the product contains the desired active ingredient(s), and use the application rate the label specifies. The rate will vary based on the specific concentration(s) of the active ingredient(s) found in the product.
  2. You won’t know if the label has changed since the last time you purchased the product. Labels can change at any time, so read the label each time you buy a product, and every time you use it, even if you think you know the product well.
  3. The site you are treating might not be on the label. “Sites” include everything from specific crops, turf species and ornamentals to foundations, indoor surfaces, and pets. There are important reasons a product cannot be applied on certain sites – for example, it may injure certain plants, pose toxicity concerns to people, result in unacceptable pesticide residues on food or feed crops, or lack sufficient research data.
  4. You might apply a product that doesn’t control your pest(s). It is not enough to know the product type (herbicide, insecticide, fungicide, etc.); you must also look at what weeds, insects, diseases or other pests are on the label, and know what pests you have.
  5. You might mix products that are incompatible. The label may tell you if certain products can or cannot be mixed, and how to test for compatibility of products that are not listed on the label.
  6. You might make the application at the wrong time, in the wrong place, or too often. Many herbicides, for example, will not control weeds that are too large. Pests that are in the soil may require different product placement than pests on leaves. Insecticides and fungicides often indicate a maximum number of applications and minimum interval between applications.
  7. You won’t understand the toxicity concerns associated with the product. The label contains a Caution, Warning or Danger signal word, which is based on the acute (single exposure) toxicity of the formulated product. The signal word reflects the most toxic category resulting from dermal, oral, inhalation or eye contact. Caution indicates that the pesticide formulation is slightly toxic by any of these four ways of contact. Warning indicates that at least one of the ways of contact is moderately toxic. Danger indicates that at least one of the ways of contact is highly toxic.
  8. You will not know the required personal protective equipment (PPE). If the label states that certain PPE is required (for example, a particular respirator or glove type), you are breaking the law and putting yourself at risk if you don’t wear the PPE for the specified task. If you are an employer and your employees are applying pesticides as part of their job, you must follow all appropriate laws concerning their use of PPE as well.
  9. If you are accidentally exposed to the product, you won’t know what to do and might not have the needed supplies on hand. The First Aid section of the label (found under the heading Statement of Practical Treatment) indicates what to do for different types of exposure. You also need the label readily available so you can answer questions from emergency personnel. Do not wait until you have symptoms if the label indicates that immediate medical attention is required.
  10. You won’t understand the possible hazards to people, pets and the environment (air, water, soil or wildlife), and whether the pesticide may pose any fire, explosion or chemical hazards. If any of these hazards exist, they will be clearly indicated in the Precautionary Statements on the label.
  11. You will be unaware of other critical information. The label contains a wealth of information, which varies depending on the product. Some examples are: when not to treat (wet surfaces, presence of pollinators); what to avoid (spray drift, surface runoff); and how long to wait (before entering the treated area, planting certain species into treated soil, or harvesting a crop for food or feed).
  12. You won’t know how to store and dispose of the product. Pesticide labels will often indicate temperature requirements, security needs and what should not be stored with the product (food, feed, seed, etc.) The Disposal section of the label will often address how to clean an “empty” container, and disposal options for containers, unwanted product and anything contaminated by the pesticide.

If you still have questions after reading the label, call the pesticide manufacturer, your Cooperative Extension Service or your State Pesticide Regulatory Agency. Some web resources are listed below.

This is the fourth in a series on pesticide stewardship sponsored by the Weed Science Society of America.

Some Resources on Reading the Pesticide Label

About the Weed Science Society of America:
The Weed Science Society of America, a nonprofit scientific society, was founded in 1956 to encourage and promote the development of knowledge concerning weeds and their impact on the environment. The Weed Science Society of America promotes research, education and extension outreach activities related to weeds, provides science-based information to the public and policy makers, fosters awareness of weeds and their impact on managed and natural ecosystems, and promotes cooperation among weed science organizations across the nation and around the world. For more information, visit www.wssa.net.