Soybeans: EPA Approves Isoxaflutole Herbicide On Resistant Varieties

Soybeans. ©Debra L Ferguson Stock Photography

The U.S. Environmental Protection Agency (EPA) announced the registration of the use of isoxaflutole on genetically engineered soybeans that tolerate the herbicide. Isoxaflutole is the active ingredient found in Balance Flexx and Corvus.

In its announcement, EPA said the registration gives farmers a new tool to use in controlling weeds that have gained resistance to other herbicides.

“Safe and effective weed management is a constant challenge that farmers face,” said American Soybean Association President and soybean grower from Worthington, Minnesota, Bill Gordon. “EPA’s registration of isoxaflutole will provide soybean growers with an important new tool to combat damaging weeds and help better control emerging herbicide-resistance issues.”

EPA reviewed relevant data and conducted detailed human health and ecological assessments in deciding to register the use of isoxaflutole on soybeans genetically engineered to resist the herbicidal effects of isoxaflutole, the agency noted in its announcement. 

In addition to the risk assessments, EPA also requested public comment on the proposed registration decision. Based on this analysis and careful consideration of public input, EPA concluded that the application of isoxaflutole on genetically engineered soybeans with certain use conditions could be done in an environmentally-protective manner in certain parts of the country.

Isoxaflutole is already registered by EPA for use on corn in 33 states. Like this existing use, the new registered use of isoxaflutole on genetically engineered soybeans is classified as a restricted-use pesticide, meaning that applicators must receive special training in order to use it.

The training will emphasize ways applicators will protect ground and surface water and non-target plants.

The new use on genetically engineered soybeans would be limited to specific counties in 25 states. EPA is limiting use to these specific counties to protect endangered or threatened species from exposure. EPA is also including additional use restrictions, such as not allowing aerial and irrigation system applications.

The registration is limited to five years during which EPA will evaluate any potential weed resistance issues that may result. As part of the terms and conditions of the registration, the registrant must provide an herbicide-resistance management plan and submit annual reports to EPA.

Here is more information, including the final registration decision.




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