The Tier 1 AgDRIFT spray drift modeling for an insecticide showed overly conservative setback distances as large as &gt;155m for non-threatened and &gt;254m for threatened species in aquatic environments in New Zealand.  A higher tier refinement was conducted to refine the AgDRIFT-estimated large buffer distance using a risk-based buffer approach such as REGDISP that uses best available science and tools. REGDISP model is an empirically based ground spray model that constructs regression equations using the newer field deposition data collected in by Wolf and Caldwell (2001 and 2004), Wolf (2011) and the Spray Drift Task Force (SDTF, 1992 and 1993). As a result, FMC REGDISP modeling suggested buffer distance ranging from 1m to 9m for non-threatened species and 20m to 78m for threatened species. REGDISP substantiated that the AgDRIFT tier 1 modeling overestimated buffer distance by 18 to 20 fold for non-threatened species and by more than 3 times for threatened species as compared to field measurements and best data fit method.

Higher tier refinement on the tier 1 AgDRIFT buffer distance using REGDISP model for environmental risk assessment in New Zealand

2019 Fall National Meeting

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