New Rules Planned for Herbicide

By Scout Nelson

The Environmental Protection Agency has released its proposed registration decision for epyrifenacil, a new active ingredient planned for use as a pre-plant burndown herbicide. The proposal covers agricultural use on canola, field corn, soybeans, wheat and fallow land, as well as non-agricultural use around industrial and farm buildings. The EPA is requesting public comments before finalizing its decision.

According to the agency, the registration request is supported by human health assessments, ecological risk evaluations, and a biological review under the Endangered Species Act. No human health risks were identified when the product is used as directed. However, EPA’s preliminary findings state that epyrifenacil may affect several listed species and critical habitats, although it is not expected to cause jeopardy or long-term habitat damage.

To reduce risks, EPA is proposing several mitigation measures. These include spray drift buffer zones to prevent off-target movement, runoff and erosion control practices to limit chemical movement into waterways, and restrictions on use during rain or when soils are saturated. Users must also follow endangered species instructions provided on the “Bulletins Live Two” online system for any additional protections.

EPA has updated the product’s proposed labeling to include all required safety restrictions and mitigation measures, ensuring the product meets the standards of the Federal Insecticide, Fungicide, and Rodenticide Act. Epyrifenacil contains fluorinated carbon, and EPA has provided additional information online about its safety review process for such chemicals.

Next steps include reviewing public comments and finalizing the agency’s risk assessments and effects of determination. If EPA decides the product meets registration standards, a final biological evaluation will be completed. If that evaluation shows potential risks to listed species or habitats, EPA will begin formal consultation with the U.S. Fish and Wildlife Service or the National Marine Fisheries Service. These agencies will determine whether additional safeguards or label changes are needed.

The public comment period for this proposal is open until December 3, 2025 through docket ID EPA-HQ-OPP-2022-0354.

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