Brazilian farmers are currently struggling with the rapid spread of herbicide-resistant weeds, particularly Amaranthus hybridus and the invasive Amaranthus palmeri. These pests have evolved to survive traditional glyphosate and acetolactate synthase inhibitors, threatening crop yields across the country's massive agricultural belt.

Rimisoxafen, classified under Groups 12 and 32 by the Herbicide Resistance Action Committee, offers a distinct dual mode of action intended to diversify weed management strategies. According to Leonardo Bastos, FMC’s vice president and chief marketing officer, the move reflects a long-term commitment to providing growers with differentiated tools to protect their harvests. The company views the filing as a critical step in addressing the complex resistance challenges currently facing the market.

This submission follows FMC’s July 2026 application to the U.S. Environmental Protection Agency. Rimisoxafen joins other emerging solutions in the company’s pipeline, including Isoflex and Dodhylex. While the regulatory review process is now underway in Brazil, the product is not yet registered for sale or use, and FMC noted that further product-specific filings will follow as the review proceeds.