The Environmental Protection Agency, in a surprising move, has decided to revoke the approval of a herbicide that was made to be used on a new generation of genetically modified crops.

 

The agency’s decision could delay the introduction of corn, soybeans and cotton developed by Dow Chemical to be resistant to the herbicide 2,4-D. But Dow said it did not anticipate a significant delay.

 

In a court filing on Tuesday, the E.P.A. said it had discovered new information suggesting that the herbicide, which Dow calls Enlist Duo, could be more toxic than previously believed.

 

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