Data on field dissipation/accumulation studies conducted at foreign sites are often submitted to the regulatory agencies worldwide under national and global joint reviews for the registration of pest control products. Region specific soil characteristics (pH, organic carbon, and texture) and climatic conditions (precipitation and temperature) determine to a large extent the fate and behaviour of a chemical. A chemical is expected to behave similarly in ecoregions that are based on similar soils and climate. Studies conducted at foreign sites are generally considered if the study sites represent local use conditions. As no ecoregion analysis based on soils and climate together is currently available, ENASGIPS (Europe North America Soil Geographic Information for pesticide studies) a geospatial model is being developed under OECD to identify comparable ecoregions between Europe and North America. The purpose of the ENASGIPS model is to compare and identify similar ecoregions, assist site section process to identify worst case scenarios based on concerns identified in the conceptual model, and provide information on crops, soils, and climate in a particular region. This model was developed with ESRI ArcGIS v10.0 and uses WHSD (World Harmonized Soil Database) for soils data and MARS FOODSEC for climate data to compare and identify similar ecoregions between Europe and North America. In this way, a field study conducted in Europe is considered by the North American regulatory agencies and vice versa. In European Union, FOCUS guidance is used to facilitate use of overseas TFD studies for regulatory purposes. In addition, the model permits selection of field sites based on concerns identified by the conceptual model. It involves a series of selection of crops, soil, and climatic parameters. The model also provides generic information on soils, climate, and crops for any particular region.

OECD guidance for acceptance of foreign pesticide field dissipation studies/ecoregion concept: Ecoregion Crosswalk model and demonstration

246th National Meeting (2013)

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