Environmental fate of dialifor and formation of its oxygen analog following application on grape vines in the San Joaquin Valley, California [USA]

Background: Foliage residue decline data are used to re ne the risk assessment for herbivorous birds and mammals foraging in elds treated with plant protection products. For evaluation, current EFSA guidance has a clear focus on single-rst order (SFO) kinetic models. However, other kinetic models are well established in other areas of environmental risk evaluations (eg, soil residue assessment), and easyto-use calculation tools have become available now. We provide case studies with 6 fungicides how such evaluations can be conducted with two of these tools (KinGUII and TREC) that have been developed by Bayer. Results: SFO kinetics provided the best ts only for 13 of 36 residue decline studies conducted in a standardized design under eld conditions. Biphasic models (double rst order in parallel, hockey stick) were often superior and sometimes more conservative for risk assessment. The additional effort is manageable when using software such as KinGUII and TREC, and appears justi ed by the more reliable outcome of the evaluations. Conclusions: Further research would be useful to better assess the extent to which non-SFO better ts foliage residue decline, but our study suggests that it may be a signi cant proportion. Therefore we encourage the use of biphasic models in the regulatory risk assessment for herbivorous birds and mammals, in the ongoing revision of the European Food Safety Authority (EFSA) guidance document from 2009.

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Pesticide persistence on foliage

Willis

McDowell

1987

Reviews of Environmental Contamination and Toxicology

114

115

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References

1989

Metabolic Maps of Pesticides

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Pesticide Residues in Environmental Samples

Nash¹,

Wells²,

Smith³

et al. 1986

Principles, Statistics, and Applications

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Environmental fate of dialifor and formation of its oxygen analog following application on grape vines in the San Joaquin Valley, California [USA]

Cited by 3 publications

References 13 publications

Pesticide persistence on foliage

Pesticide persistence on foliage

References

Pesticide Residues in Environmental Samples

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