Abstract
The susceptibility of the predatory bugOrius laevigatus (Fieber) to the insect growth regulators diflubenzuron, pyriproxyfen, the nitroguanidine insecticide imidacloprid and the thiourea compound diafenthiuron was investigated in the laboratory. Fifth-instar nymphs were exposed to formulated materials of each compound and adults were exposed to formulated materials of diafenthiuron and imidacloprid. In each case, exposure via ingestion and residual contact was tested. Pyriproxyfen was harmless toO. laevigatus nymphs by both ways of exposure. The respective LC50-values of diflubenzuron via ingestion and residual contact were 229.9 and 391.1 mg a.i./l. Diafenthiuron did not cause significant mortality to fifth-instar nymphs and adults via ingestion but was toxic by residual contact with LC50-values of 329.4 mg a.i./l and 125.9 mg a.i./l for nymphs and adults respectively. Imidacloprid proved to be the most toxic compound with LC50-values of 1.1 and 0.04 mg a.i./l for nymphs and 2.1 and 0.3 mg a.i./l for adults, via ingestion and residual contact, respectively. The results suggest that use of pyriproxyfen in an integrated pest management programme will not cause any problems but that imidacloprid, and to a lesser extent, also diflubenzuron and diafenthiuron could be harmful to the predator.
Résumé
La sensibilité du prédateurO. laevigatus envers les insecticides diflubenzuron, pyriproxyfen, imidacloprid et diafenthiuron a été déterminée au laboratoire. Les larves du cinquième stade ont été exposées aux matériaux formulés de chaque produit et les adultes ont été exposés aux matériaux formulés de diafenthiuron et imidacloprid. Dans tous les cas, le traitement par ingestion et par contact résiduel a été examiné.
Le pyriproxyfen s’est avéré sans danger pour les larves deO. laevigatus selon les deux manières d’exposition. Les valeurs CL50 du diflubenzuron par ingestion et contact résiduel étaient de 229.9 et 39.1 mg m.a./l., respectivement. Le diafenthiuron n’a pas provoqué de mortalité significative par ingestion chez les larves et les adults. Par contre, le diafenthiuron s’est montré toxique par contact résiduel, avec des valeurs CL50 de 329.4 et 125.9 mg m.a./l pour les larves et les adultes, respectivement. L’imidacloprid était le produit le plus toxique avec des valeurs CL50 DE 1.1 ET 0.04 mg m.a./l pour les larves et 2.1 et 0.3 mg m.a./l pour les adultes, par ingestion et par contact résiduel, respectivement.
Les données suggèrent que l’usage du pyriproxyfen ne causera pas de problèmes dans un programme de lutte intégrée. Cependant l’usage de l’imidacloprid et, à un degré moindre, du diflubenzuron et du diafenthiuron en combinaison avecO. laevigatus doit être considéré avec prudence.
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Delbeke, F., Vercruysse, P., Tirry, L. et al. Toxicity of diflubenzuron, pyriproxyfen, imidacloprid and diafenthiuron to the predatory bugOrius laevigatus (Het.: Anthocoridae). BioControl 42, 349–358 (1997). https://doi.org/10.1007/BF02769828
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DOI: https://doi.org/10.1007/BF02769828