Endangered Species Assessment (ESA) is required for new registrations and over-the-top use of crop protection chemicals by the U.S. regulatory agency. The current regulatory approach estimates runoff exposure using regulatory standard crop scenarios considering weather variability in HUC-2 watersheds. The resulted exposures are not site-specific but are used to characterize risks in spatially explicit habitats/ranges of endangered species. This assumption causes many uncertainties as location-specific exposure characteristics is not considered. To quantify runoff exposure at a field scale, which is more appropriate for ESA, a web-based, site-specific exposure modeling tool is developed with the Agricultural Policy Environmental eXtender (APEX) model. This tool can conduct rapid location-specific runoff evaluations at field-scale with automatic model setup of APEX with GIS functions by guided buttons-clicks. It can also simulate impacts of land management and best management practices. A national level database, including spatial data layers of elevation, land use, soil, and tabular data of weather and crop/land management, was created for automated model setup. Evaluation of APEX pesticide simulation and a comparison of APEX with regulatory model PRZM will also be presented.

Web-based, site-specific exposure modeling for endangered species assessment

Fall 2022 abstracts, posters, and presentations will launch in mid-September.

ACS Fall 2022

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