Published online by Cambridge University Press: 31 May 2012
In laboratory bioassays, four carabid species [Agonum dorsale (Pontoppidan), Bembidion lampros (Herbst), B. obtusum Serville, and Demetrias atricapillus (L.)] that are important predators of aphids in cereals in the United Kingdom were exposed to deposits of deltamethrin, dimethoate, or pirimicarb on glass for up to 72 h. We detected differences between compounds and species that are discussed in the context of exposure of these predators to insecticides in the field. We also describe problems involved in obtaining comparative toxicity data when dilutions of field application rates for target species are used in bioassays with nontarget species. Such problems add another dimension to risk assessment based on laboratory data.
Au cours de tests en laboratoire, quatre espèces de carabes [Agonum dorsale (Pontoppidan), Bembidion lampros (Herbst), B. obtusum Serville et Demetrias atricapillus (L.)] qui sont d’importants prédateurs des pucerons sur les céréales en Grande-Bretagne ont été exposées pendant plus de 72 h à des frottis de deltaméthrine, de diméthoate ou de pirimicarbe sur du verre. Nous avons constaté des différences entre les produits et les espèces et ces différences sont examinées dans le contexte d’une exposition de ces prédateurs aux insecticides en nature. Nous décrivons également les problèmes encourus lors de l’obtention de données comparatives de la toxicité par emploi de dilutions utilisées en nature sur des espèces cibles au cours de tests en laboratoire sur des espèces non cibles. Ces problèmes ajoutent une nouvelle dimension aux évaluations, à partir de données de laboratoire, des risques reliés à des traitements.
[Traduit par la Rédaction]
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