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SETAC Spotlight: Validation and refinement of crop development dates used in pesticide exposure modelling and risk assessment: collation and analysis of regulatory field trial data

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SETAC Spotlight: Validation and refinement of crop development dates used in pesticide exposure modelling and risk assessment: collation and analysis of regulatory field trial data

CEA presented 17 posters and platforms at SETAC Copenhagen in May 2022. Over the coming weeks we will be showcasing each of these presentations in a series of 'SETAC Spotlight' articles. This week it is:

Validation and refinement of crop development dates used in pesticide exposure modelling and risk assessment: collation and analysis of regulatory field trial data

Author: Greg Hughes

Determining appropriate pesticide application windows is an important component of pesticide exposure modelling; increasingly, regulators are constraining these application windows using estimates of the timing of BBCH crop growth stages from AppDate. For example, the “repaired” version of the FOCUS SW models will have AppDate integrated directly into the software shell to remove “subjectivity” from the selection of application windows. The AppDate (Klein, 2012) software calculates consistent application dates for use in FOCUS SW and GW modelling with the purpose of aligning the product GAP being assessed with the fixed model crops described by the FOCUS models. The dates for major crop development stages, e.g., BBCH 10, captured in AppDate are based on various sources, differentiated for GW and SW, with linear interpolation used for BBCH growth stages between these. Given exposure assessments are a function of the application dates this software generates, it is important to understand how realistic and representative they are; however, there is currently no comprehensive, quality-controlled, readily available, pan-European crop phenology dataset available to undertake such an assessment or for use in regulatory risk assessment refinement. The crop protection industry holds large quality-controlled datasets of BBCH crop growth stages within their efficacy and residue trials datasets that span the required crop types as well as the agronomic and pedoclimatic diversity of Europe. A Crop Life Europe (CLE) project has sourced efficacy trial datasets from 7 members and created a harmonised crop development dataset that allows for the assessment and, where required, the justification of more realistic and location specific dates in regulatory risk assessment refinements. The data collection process has highlighted that residue trial datasets are not typically stored in a format that makes them easily combined with the efficacy trials datasets. The harmonised database spans two decades (2000-2020), comprises >250 crops (combinable, top/soft fruit, pasture/grass, ornamentals, vegetables and herbs amongst others) and covers 25 EU Member States, 3 EEA countries as well as Switzerland and the UK. This poster describes the database created in more detail, presents preliminary results for representative crops and outlines opportunities for the further development of exposure science to allow for more accurate and realistic risk assessment.

This poster is avaliable for free download.

For further information about this work please contact Greg Hughes.

You can find all of the other posters and platforms that CEA presented at SETAC Copenhagen here. You can also find all of our publications from previous conferences and links to journal articles we have authored on our library page.

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