FMC's Rimisoxafen Earns First Dual-Mode Herbicide Classification

Event summary

  • FMC's rimisoxafen becomes first herbicide classified with dual mode of action (HRAC Groups 12 and 32).
  • Dual inhibition targets phytoene desaturase (PDS) and solanesyl diphosphate synthase (SDPS) pathways.
  • Effective against palmer amaranth and waterhemp, weeds resistant to 8 herbicide classes.
  • Regulatory submissions for rimisoxafen to begin in 2026 across key global markets.
  • Third novel herbicide developed by FMC in recent years after Isoflex® and Dodhylex™.

The big picture

FMC's breakthrough classification addresses a critical industry challenge: herbicide resistance. With palmer amaranth alone costing U.S. farmers billions annually, rimisoxafen's dual-mode mechanism could reshape weed management strategies. The innovation positions FMC as a leader in sustainable crop protection solutions, though success hinges on navigating global regulatory landscapes and demonstrating real-world efficacy at scale.

What we're watching

Regulatory Momentum
The pace at which rimisoxafen gains approvals in key markets will determine commercialization timelines.
Market Adoption
Whether farmers will prioritize dual-mode solutions over existing herbicide combinations.
Competitive Response
How rivals like Bayer and Syngenta may accelerate their own resistance-fighting herbicide pipelines.