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RELATIVE TOXICITY OF SIX INSECTICIDES TO MALE AND FEMALE PHOLETESOR ORNIGIS (WEED) (HYMENOPTERA: BRACONIDAE), A PARASITE OF THE SPOTTED TENTIFORM LEAFMINER, PHYLLONORYCTER BLANCARDELLA (FABR.) (LEPIDOPTERA: GRACILLARIIDAE)

Published online by Cambridge University Press:  31 May 2012

R.M. Trimble  and
D.J. Pree
R.M. Trimble
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada LOR 2E0
D.J. Pree
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada LOR 2E0
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Abstract

The susceptibility of male and female Pholetesor ornigis (Weed) to the pyrethroid insecticides permethrin, fenvalerate, and deltamethrin, the organophosphorous insecticides azinphosmethyl and phosmet, and the carbamate insecticide methomyl, was compared in the laboratory using two populations from Norfolk County, Ontario. Female P. ornigis were more susceptible than males to permethrin. There was no sexual difference in the susceptibility of P. ornigis to the other five insecticides tested. The implications of these results for the biological control potential of P. ornigis in commercial apple orchards are discussed. The results obtained for permethrin, fenvalerate, azinphosmethyl, and methomyl were compared with those obtained in a study completed 6 years earlier using P. ornigis from another location in Ontario; the results suggest that P. ornigis from Norfolk County have low levels of resistance to permethrin (3.3-fold), fenvalerate (2.2-fold), and methomyl (4.1-fold).

Résumé

La sensibilité de mâles et femelles de Pholetesor ornigis (Weed) aux pyréthrines synthétiques perméthrine, fenvalérate et deltaméthrine, aux insecticides organophosphorés azinphosméthyl et phosmet et au méthomyl à base de carbamate a été comparée en laboratoire sur deux populations issues du comté de Norfolk en Ontario. Les femelles de P. ornigis, sont plus sensibles que les mâles aux pyréthrines. On n’observe aucune différence sexuelle dans la sensibilité de P. ornigis aux cinq autres insecticides testés. Les auteurs étudient les répercussions de ces résultats pour la possibilité de lutte biologique contre P. ornigis dans des vergers de pommes commerciaux. Les résultats obtenus pour la perméthrine, le fenvalérate, l’azinphosméthyl et le méthomyl sont comparés à ceux obtenus dans une étude effectuée 6 ans plus tôt sur P. ornigis issu d’un autre endroit en Ontario; les résultats donnent à penser que P. ornigis issu du comté de Norfolk est moins résistant à la perméthrine (3,3 fois moins), au fenvalérate (2,2 fois moins) et au méthomyl (4,1 fois moins).

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 2 , February 1987 , pp. 153 - 157
Copyright
Copyright © Entomological Society of Canada 1987

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