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Page 2 <br />Florpyrauxifen-benzyl Chemical Fact Sheet <br />Herbicide Degradation, Persistence <br />and Trace Contaminants <br />Florpyrauxifen-benzyl is broken down <br />quickly in the water by light (i.e., photolysis) and <br />is also subject to microbial breakdown and <br />hydrolysis. It has a half-life (the time it takes for <br />half of the active ingredient to degrade) ranging <br />from 1 — 6 days. Shallow clear -water lakes will <br />lead to faster degradation than turbid, shaded, <br />or deep lakes. <br />Florpyrauxifen-benzyl breaks down into five <br />major degradation products. These materials <br />are generally more persistent in water than the <br />active herbicide (up to 3 week half-lives) but four <br />of these are minor metabolites detected at less <br />than 5% of applied active ingredient. EPA <br />concluded no hazard concern for metabolites <br />and/or degradates of Florpyrauxifen-benzyl that <br />may be found in drinking water, plants, and <br />livestock. <br />Florpyrauxifen-benzyl binds tightly with <br />surface sediments, so leaching into groundwater <br />is unlikely. Degradation products are more <br />mobile, but aquatic field dissipation studies <br />showed minimal detection of these products in <br />surface sediments. <br />Impacts on Fish and Other Aquatic <br />Organisms <br />Toxicity tests conducted with rainbow trout, <br />fathead minnow, water fleas (Daphnia sp.), <br />amphipods (Gammarus sp.), and snails <br />(Lymnaea sp.) indicate that florpyrauxifen-benzyl <br />is not toxic for these species. EPA concluded <br />florpyrauxifen-benzyl has no risk concerns for <br />non -target wildlife and is considered "practically <br />non-toxic" to bees, birds, reptiles, amphibians, <br />and mammals. <br />Florpyrauxifen-benzyl does not <br />bioaccumulate in fish or freshwater clams due to <br />rapid metabolism and chemical depuration. <br />Human Health <br />EPA has identified no risks of concern to <br />human health since no adverse acute or chronic <br />effects, including a lack of carcinogenicity or <br />mutagenicity, were observed in the submitted <br />toxicological studies for florpyrauxifen-benzyl <br />regardless of the route of exposure. EPA <br />concluded with reasonable certainty that <br />drinking water exposures to florpyrauxifen- <br />benzyl do not pose a significant human health <br />risk. <br />For Additional Information <br />Environmental Protection Agency Office of <br />Pesticide Programs <br />www.epa.gov/pesticides <br />Wisconsin Department of Agriculture, Trade, <br />and Consumer Protection <br />hfti)7Hdatcp.wi.gov/Plants/Pesticides/ <br />Wisconsin Department of Natural Resources <br />608-266-2621 <br />htti)://dnr.wi.gov/lakes/i)lants/ <br />National Pesticide Information Center <br />1-800-858-7378 <br />http://npic.orst.edu/ <br />Washington State Department of Ecology. 2017. <br />https://fortress.wa.gov/ecv/i)ublications/documen <br />is/1710020.pdf <br />QJWisconsin Department of Natural Resources EGAD #: 3200-2018-83 <br />Box 7921 <br />Madison, W153707-7921 <br />