ProcellaCOR is a systemic herbicide that mimics a plant’s growth hormone. It kills the entire plant, leaving decomposing biomass at the bottom of the lake. The active ingredient is Florpyrauxifen‐benzyl, and it can be used at much lower dosages than previous herbicides used to treat Eurasian watermilfoil, including ones previously used or considered on Adirondack lakes.

The herbicide is registered for use in rice-growing operations and for weed control in freshwater. In the Adirondacks, herbicide proponents hope ProcellaCOR can help fight back Eurasian watermilfoil, one of the park’s most pervasive invasive weeds. Documents filed with the APA from region’s seeking permission to use ProcellaCOR project it will control invasive milfoil for three seasons.