Glyphosate has low acute and long-term toxicity to birds and honey bees in standard regulatory studies. However, because of highly conservative assumptions in Tier 1 ecological risk assessments, there are challenges to pass a Tier 1 assessment for high use but low toxicity pesticides like glyphosate. Consequently, several exposure refinements have been introduced to these long-term glyphosate assessments to overcome the inherent conservatism of Tier 1 dietary assessments and achieve an acceptable ecological risk assessment for endangered and non-endangered species. Areas of exposure refinement that will be reviewed include residue studies with plants, insects, pollen and nectar. These studies were conducted to measure glyphosate-specific initial residues and rates of dissipation to calculate time-weighted-averages to refine exposure calculations for these long-term risk assessments. This presentation will describe how these data were developed and approaches to leverage these exposure refinements in higher-tier ecological risk assessments.

Leveraging product specific residue data to refine dietary ecological assessments

256th National Meeting (2018)

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