Various elements of the higher-tier risk assessment of synthetic pyrethroids conducted by the Pyrethroid Working Group (PWG) are being presented in numerous posters and platforms in this symposium. This poster presents the final risk characterization from the assessment, integrating the results of the refined probabilistic exposure modeling and the full range of ecological effects data (including species sensitivity distributions and species response distributions). The results of the probabilistic risk assessment are expressed in the form of risk statements that accurately describe inherent assumptions and uncertainties. Quantitative risk characterization, incorporating Risk Quotients for standard and lower tier EEC's and Joint Probability Curves for more refined assessments, shows that the potential aquatic risk of pyrethroid use is much lower than indicated by the screening-level assessment for a wide range of crops. Consideration of other factors that affect the behavior of pyrethroids in the environment suggests that even the refined exposure assessments over-predict real-world concentrations.

Higher-tier risk characterization of agricultural uses of synthetic pyrethroids: Species sensitivity distributions, species response distributions, risk quotients, joint probability curves, and risk statements

248th National Meeting (2014)

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