So far pesticide terrestrial field dissipation (TFD) studies are conducted in North America and/or Europe to fulfill data requirements on persistence ,dissipation, degradation rates, formation and decline of transformation products, volatilization, plant uptake, leaching, , etc in the field under actual use conditions. Recently the OECD had developed a guidance document for conducting pesticide terrestrial field dissipation studies (OECD 2016, GD 232). Therein an Ecoregion Similarity Model (ENASGIPS) is described for gaining acceptance of field studies conducted in NAFTA to Europe and vice versa,. While the tool currently is used across regions in the Northern hemisphere there is no obvious scientific reason, why its applicability should not been extended to other regions of the world, and even applied for an ecoregion cross walk between the Southen an the Northern hemisphere . An experimental and GIS/modeling feasibility study (“Southside”) was therefore intitiated to demonstrate if TFD-studies conducted in the Southern hemisphere (i.e. New Zealand, Chile) under climatic, soil and cropping conditions similar to conditions in the Northern hemisphere may deliver similar endpoints (degradation rates in soil, DegT50) than those from Europe or the NAFTA region. We describe the general principles and results of the feasibilty study and their regulatory contextualisation according to the principles laid down in the OECD guidance. OECD (2016) Guidance Document for Conducting Pesticide Terrestrial Field Dissipation Studies Series on Testing & Assessment No. 232 Series on Pesticides No. 82 JT03391244

Global use of field trials based on ecoregion similarities: Southside (Southern vs. Northern Hemisphere)

254th National Meeting (2017)

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