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RESIDUES OF FOUR SYNTHETIC PYRETHROIDS AND AZINPHOS-METHYL ON APPLE FOLIAGE AND THEIR TOXICITY TO AMBLYSEIUS FALLACIS (ACARI: PHYTOSEIIDAE)1

Published online by Cambridge University Press:  31 May 2012

N. J. Bostanian
Affiliation:
Agriculture Canada, Research Station, St-Jean-sur-Richelieu, Quebec J3B 628
A. Belanger
Affiliation:
Agriculture Canada, Research Station, St-Jean-sur-Richelieu, Quebec J3B 628
I. Rivard
Affiliation:
Agriculture Canada, Research Station, St-Jean-sur-Richelieu, Quebec J3B 628

Abstract

Residue analysis of apple foliage obtained from an orchard treated with the insecticides cypermethrin, fenvalerate, deltamethrin, permethrin, and azinphos-methyl revealed detectable residues on the leaves 8–9 weeks after the last treatment. Laboratory studies of foliage showed that of the synthetic pyrethroids, permethrin was initially as toxic as the other synthetic pyrethroids; however, its toxicity decreased considerably by the 5th and 6th week post-treatment. Azinphos-methyl was the least persistent and toxic insecticide evaluated. Unless new pest-management strategies are developed, the use of synthetic pyrethroids post-bloom in an integrated-pest-management program would not be desirable where Amblyseius fallacis (Garman) is the principal predator of phytophagous mites.

Résumé

Les analyses de résidus d'insecticides sur des feuilles de pommiers provenant d'un verger traité avec chacun des insecticides suivants : cyperméthrine, fenvalerate, deltaméthrine, perméthrine et azinphos-méthyl ont révélé des traces détectables sur les feuilles après huit et neuf semaines de la date du dernier traitement. Des études toxicologiques en laboratoire avec ces feuilles traitées ont montré que parmi les pyréthrinoïdes de synthèse, la perméthrine a été initialement aussi toxique que les autres pyréthrinoïdes de synthèse, mais sa toxicité a diminué considérablement cinq à six semaines après le dernier traitement. L'azinphos-méthyle a été le moins persistant et le moins toxique parmi les insecticides évalués. A moins que des nouvelles stratégies de lutte soient développées, l'emploi des pyréthrinoïdes de synthèse après la floraison ne serait pas souhaitable dans un programme de lutte intégrée où Amblyseius fallacis (Garman) est le prédateur principal des acariens phytophages.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1985

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