The Pyrethroid Working Group (PWG) is conducting a higher-tier ecological risk assessment for 9 synthetic pyrethroid insecticides in support of U.S. registration review. Many elements of the assessment are presented in other posters in this symposium. This poster provides an overview of the PWG assessment, including the conceptual model, aquatic toxicity and ecological effects, and refined aquatic exposure modeling. The exposure analysis for residential pyrethroid use implements a field-calibrated urban stormwater model and incorporates data from surveys of pest control professionals in several regions of the U.S. as well as field data on pyrethroid runoff from different residential application practices. The probabilistic exposure analysis for agricultural pyrethroid use is based on spatial data at the watershed, regional, and national level, and bridges the gap between the standard farm pond scenario and the real-world landscape. For both residential and agricultural applications, the assessment shows that potential aquatic risk is much lower than indicated by conservative, screening-level models. Analysis of assumptions, uncertainties, and additional factors related to pyrethroid behavior indicates that even the probabilistic assessment over-predicts the risk of pyrethroids to aquatic populations.

Aquatic risk assessment of agricultural and residential uses of pyrethroid insecticides in the US: An overview

248th National Meeting (2014)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.