Fomesafen is one of the first active ingredients in EPA's new Registration Review program undergoing a national-level ecological risk and effects assessment for federally-listed endangered and threatened species. After review of EPA's initial draft assessment, several areas were identified where additional data or modeling could be used to refine the assessment. These areas included soil residue, aquatic metabolism, efficacy, plant recovery and taxonomic sensitivity data, as well as geo-spatial data for identifying the proximity of endangered species to areas of potential fomesafen use. Methods for assessing and determining the potential for direct and indirect effects to non-target organisms were also explored, along with refinements to exposure models including T-REX, TerrPlant, AgDRIFT�, and AGDISP. This presentation will discuss available data and techniques that are important in refining a national-level endangered species assessment for fomesafen.

Fomesafen endangered species assessment: Novel approaches for assessment refinement

242nd National Meeting (2011)

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