FMC submits first global EPA dossier for herbicide rimisoxafen

FMC Corporation (NYSE: FMC) has filed a regulatory dossier for rimisoxafen with the U.S. Environmental Protection Agency, marking the first global regulatory submission for the herbicide active ingredient. The submission covers use on corn, soybean, sunflower and select pulse crops.

Rimisoxafen is classified by the Global Herbicide Resistance Action Committee as the first herbicide active ingredient designated with a dual mode of action, placed under Groups 12 and 32. The classification means the compound inhibits two distinct biochemical pathways in weeds. FMC states the ingredient was discovered at its Stine Research Center following more than a decade of biology research and more than 1,000 field and greenhouse studies.

"Filing the first regulatory dossier for rimisoxafen with the EPA represents a significant milestone for FMC," said Seva Rostovtsev, executive vice president and chief technology officer at FMC. "Years of innovation and scientific discovery have brought us to this point."

According to a 2025 Weed Science Society of America National Weed Survey, Palmer amaranth and waterhemp are the most troublesome broadleaf weeds in U.S. soybean production. FMC says rimisoxafen has shown activity against both in field testing. The U.S. market includes more than 70 million hectares of corn and soybeans, with growers spending more than $6 billion annually on weed control.

Rimisoxafen is the third novel herbicide active ingredient FMC has advanced to regulatory submission in recent years, following Isoflex active and Dodhylex active. FMC said it intends to pursue regulatory submissions in additional geographies as part of a global development program. The product is not currently registered for sale or use in the United States or any other country.

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