Flutriafol is a new fungicide conditionally registered on crops in the U.S. which is moderately water soluble and shows slow aerobic degradation in soil. Because of these fate parameters, the U.S. EPA required a prospective groundwater monitoring study as a condition of registration, to investigate the potential of flutriafol to leach into shallow groundwater. To understand the environmental fate of flutriafol, the U.S. EPA model PRZM3.12.2 was calibrated to emulate flutriafol behavior observed for seven field studies in the U.S. and Europe. PRZM 3.12 was then used in a Probabilistic Leaching Exposure Assessment (PLEA) to rank flutriafol leaching vulnerability for 57,191 soil/climate combinations representing most agricultural soils within the U.S. Area-weighted STATSGO mapping units were used to rank leaching vulnerability based on predicted flutriafol residues leached below 3m soil depth. This ranking was used to identify geographical areas and soil types representing 90th percentile vulnerability for flutriafol leaching potential for the site selection process for the U.S. prospective groundwater study.

National probabilistic leaching exposure assessment for use in identifying potential sites for conduct of a prospective groundwater study

248th National Meeting (2014)

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