By Brett Bultemeier and Lauren Diepenbrock
The status and availability of chlorpyrifos has had numerous, and at times, confusing changes due to new rules, court rulings and Environmental Protection Agency (EPA) decisions. The point of this article is to clearly define if chlorpyrifos can be used and until what date. As always, changes are possible in the future and users must always read and follow the label.
The products found in Table 1 are the formulations containing chlorpyrifos that are still allowed to be used (according to the label) on food. These products can continue to be used according to the label, although there will likely be changes to these labels soon. The EPA has identified 11 uses that it anticipates will be allowed in the future, albeit with changes to use pattern and exposure mitigation measures. The EPA intends to limit these products to the following uses: alfalfa, apple, asparagus, cherry (tart), citrus, cotton, peach, soybean, strawberry, sugar beet and wheat (spring and winter). Furthermore, there are state limitations for these crop sites. In Florida, only the following crops will have tolerances and uses: citrus, cotton, peach and soybean. Note that strawberry is not on the allowed list.
| Table 1. Chlorpyrifos products still approved with food uses. | |
| EPA Registration No. | Product Name |
| 931382-7 | Gharda, Pilot 4E1 |
| 93182-8 | Gharda, Pilot 15G1 |
| 19713-505 | Drexel, Chlorpyrifos 15G |
| 19713-520 | Drexel, Chlorpyrifos 4E-AG |
| 19713-527 | Drexel, CHLOR-PY-REX |
| 19713-599 | Drexel, Chlorpyrifos 4E-AG2 |
| 19713-671 | Drexel, Lambdafos |
| 34704-857 | Loveland, Warhawk |
| 34703-1077 | Loveland, Warhawk Clearform |
| 34704-1086 | Loveland, Match-Up |
| 1 These products have been limited by the manufacturer to the 11 crop groups discussed in this article. | |
The products found in Table 2 are those formulations where the product has been cancelled, but any product still in the user’s supply can be sprayed. These products can be used as the label directs on food crops until June 30, 2025, at which point continued use would be restricted. These products are unlikely to be available for sale, and finding alternatives to these products is advisable.
| Table 2. Chlorpyrifos products that are canceled but can still be used on food until June 30, 2025. | |
| EPA Registration No. | Product Name |
| 66222-19 | ADAMA, Chlorpyrifos 4E AG |
| 66222-233 | ADAMA, Vulcan |
| 11678-58 | ADAMA, Pyrinex |
| 83222-20 | Winfield, CPF/Yuma 4E |
| 83222-34 | Winfield, CPF 15G |
| 1381-243 | Winfield, Tundra Max/Supreme |
| 89168-20 | Liberty, Chlorpyrifos Bifenthrin |
| 89168-24 | Liberty, Chlorpyrifos 4E |
Any products containing chlorpyrifos not found in Table 1 and Table 2 have either been canceled or do not allow use on food. At this point, using any of these products on food crops would constitute a misuse. Any remaining stocks of these products should be properly disposed of and might qualify for Operation Cleansweep.
Ensure the products you are using are registered in the state of Florida and that no additional restrictions are in place. As of June 24, 2024, Florida has no additional restrictions. Given the June 30, 2025 cutoff date on some products, the dramatic reduction of uses and possible future changes, finding alternative pest control options for food crops is advisable. For possible alternatives, refer to the Florida Citrus Production Guide.
For more information about these decisions, refer to the federal register and the FAQ page EPA has established for these products.
The U.S. Department of Agriculture can help with any additional questions by reaching out to Clayton Myers (Clayton.Myers@usda.gov) at the Office of Pest Management Policy or Kimberly Nesci (Kimberly.Nesci@usda.gov). Growers can also contact EPA (OPPChlorpyrifosInquiries@epa.gov).
Brett Bultemeier and Lauren Diepenbrock are University of Florida Institute of Food and Agricultural Sciences assistant professors.
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