Person: Bär, Susanne
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Susanne
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Veröffentlichung Simulating spray series of pesticides in agricultural practice reveals evidence for accumulation of environmental risk in soil(2020) Sybertz, Alexandra; Bär, Susanne; Ottermanns, Richard; Frische, Tobias; Schäffer, Andreas; Ullrich, ChristianMultiple pesticide residues in the environment originate from combination products with two or more active substances, from tank mixtures prepared by the farmers and from subsequent applications of pesticides in spray series. Consequently, mixtures of pesticide residues in agricultural soils are often detected long after application. To simulate the â€Ìaccumulated mixture riskâ€Ì towards earthworms resulting from a pesticide spray series for apple orchards, a model was applied considering both the dissipation of the applied pesticides over time and their individual toxicities. The model simulation for assessing the time-dependent mixture risk is applicable for several years and revealed that the â€Ìaccumulated mixture riskâ€Ì for earthworms clearly did not meet the threshold values for an acceptable risk according to the legal requirements in the EU approval procedure. Multiple pesticide residues from spray series are not yet considered in the environmental risk assessment (ERA) which is based on the application of single pesticide substances and products. We propose that the accumulation of residues during typical agricultural spray series should be included when assessing the risk of pesticides. © 2019 Elsevier B.V.