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July 2018 EGAD #: 3200-2018-83 Florpyrauxifen-benzyl Chemical Fact Sheet Formulations Florpyrauxifen-benzyl was registered with the EPA for aquatic use in 2017. The active ingredient is 2-pyridinecarboxylic acid, 4-amino- 3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl )- 5 -fluoro-, phenyl methyl ester. The current Wisconsin -registered formulation is a liquid (ProcellaCORTm EC) solely manufactured by SePRO Corporation. Aquatic Use and Considerations Florpyrauxifen-benzyl is a systemic herbicide that is taken up by aquatic plants. The herbicide is a member of a new class of synthetic auxins, the arylpicolinates, that differ in binding affinity compared to other currently registered synthetic auxins. The herbicide mimics the plant growth hormone auxin that causes excessive elongation of plant cells that ultimately kills the plant. Susceptible plants will show a mixture of atypical growth (larger, twisted leaves, stem elongation) and fragility of leaf and shoot tissue. Initial symptoms will be displayed within hours to a few days after treatment with plant death and decomposition occurring over 2 — 3 weeks. Florpyrauxifen- benzyl should be applied to plants that are actively growing; mature plants may require a higher concentration of herbicide and a longer contact time compared to smaller, less established plants. Florpyrauxifen-benzyl has relatively short contact exposure time (CET) requirements (12 — 24 hours typically). The short required CET may be advantageous for localized treatments of submersed aquatic plants, however, the target species efficacy compared to the size of the treatment area is not yet known. In Wisconsin, Florpyrauxifen-benzyl may be used to treat the invasive Eurasian watermilfoil (Myriophyllum spicatum) and hybrid Eurasian watermilfoil (M. spicatum X M. sibiricum). Other invasive species such as floating hearts (Nymphoides spp.) are also susceptible. In other parts of the country, it is used as a selective, systemic mode of action for spot and partial treatment of the invasive plant hydrilla (Hydrilla verticillata). Desirable native species that may also be negatively affected include waterlily species (Nymphaea spp. and Nuphar spp.), pickerelweed (Pontederia cordata), and arrowhead (Sagiffaria spp.). It is important to note that repeated use of herbicides with the same mode of action can lead to herbicide -resistant plants, even in aquatic plants. Certain hybrid Eurasian watermilfoil genotypes have been documented to have reduced sensitivity to aquatic herbicides. In order to reduce the risk of developing resistant genotypes, avoid using the same type of herbicides year after year, and utilize effective, integrated pest management strategies as part of any long-term control program. Post -Treatment Water Use Restrictions There are no restrictions on swimming, eating fish from treated waterbodies, or using water for drinking water. There is no restriction on irrigation of turf. Before treated water can be used for non-agricultural irrigation besides turf (such as shoreline property use including irrigation of residential landscape plants and homeowner gardens, golf course irrigation, and non-residential property irrigation around business or industrial properties), follow precautionary waiting periods based on rate and scale of application, or monitor herbicide concentrations until below 2 ppb. For agricultural crop irrigation, use analytical monitoring to confirm dissipation before irrigating. The latest approved herbicide product label should be referenced relative to irrigation requirements. The Wisconsin Department of Natural Resources provides equal opportunity in its employment, programs, services, and functions under an Affirmative Action Plan. If you have any questions, please write to Equal Opportunity Office, Department of Interior, Washington, D.C. 20240. This publication is available in alternativeformat (targeprint, Braille, audio tape. etc.) upon request. Please call (608) 267-7694 for more information.