The Environmental Protection Agency on Friday reapproved the weed killer dicamba for use on genetically modified soybeans and cotton, a pesticide that has raised widespread concern over its tendency to drift and destroy nearby crops.
The agency said dicamba was critical for farmers who would otherwise have their crops threatened by fast growing weeds. To ensure the pesticide is used safely, the agency said it imposed strong protections and limits on its use.
Dicamba is a common weed killer that can be sprayed on top of genetically engineered crops. It kills the weeds but doesn’t hurt the crops. It has been in use for decades, but it has become more widespread on farms in recent years.
Advocates sharply criticized the agency, saying they are moving forward after courts blocked similar efforts in 2020 and 2024. Allowing its use on these two common crops will drastically expand how much is applied and increase harm, advocates say.
Kelly Ryerson, an activist with the Make American Healthy Again movement that has forged a fragile political allegiance with the Trump administration, said she was disheartened by the decision.
“A top priority of mine was to have the use of Dicamba for over-the-top applications permanently discontinued because” of their harm, she said. “New restrictions on use are not sufficient, and will perpetuate the chemical treadmill where many farmers are trapped.”
The EPA said growers want the weed killer and they need to be supported — and that it isn’t a MAHA versus EPA issue.
The agency said concerns about dicamba drifting to places where it was not intended are real and must be managed. It set limits on how much can be applied per acre, how much can be applied on hot days and established buffer zones to prevent harm to nearby crops. If followed, the chemical can be used without threatening humans or the environment, according to EPA.
The American Soybean Association applauded the decision, saying clear rules would help farmers prepare for the next growing season and control destructive weeds.
Environmental groups said dicamba drift has damaged immense acreage, devastating vegetable farms, trees and other critical plants.
“When push comes to shove, this administration is willing to bend over backward to appease the pesticide industry, regardless of the consequences to public health or the environment,” said Nathan Donley, environmental health science director at the nonprofit Center for Biological Diversity.
Environmentalists said the EPA’s use restrictions are insufficient, allowing application for too much of the time and for too many days of the year. The buffer the agency uses to prevent harm to nearby plants has already proved ineffective, they said.
Researchers have been working to better understand its health risks. A 2020 study in the International Journal of Epidemiology found that dicamba exposure was linked to an increased risk for some cancers, including liver cancer and a type of leukemia affecting the blood and bone marrow.
Bayer, a manufacturer of dicamba, said the federal registration will allow them to now seek state approvals. They’ll launch training for applicators in the coming weeks.
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