Investigation of the insecticide resistance mechanisms of the termite, Coptotermes formosanus (Shiraki), and the sweet potato weevil, Cylas formicarius eleganüdus (Summer).

Document Type : Original Article

Authors

1 Department of plant Protection, Faculty of Agriculture, University of Tanta, Tanta, Egypt.

2 Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyns, Okinawa 9034129„ Japan.

10.21608/jpces.2001.459716

Abstract

Toxicity of fenobucarb, chlorpyrifos, fenitrothion and dichlorvos insecticides against adult stages of the termites and the sweet potato weevils was estimated. LC50, values were 1.2 02.24, U.G68 and 1.12 ng/mg body weight respectively the termites, and 1350, 17.2 18.8 and 660 ng/mg body weight for the sweet potato weevils. All these compounds were much more active against termites than the sweet potato weevils. Chlorpyrifos was the most active insecticide against both insects followed by the two other organophosphorus compounds (fenitrothion and dichiorvos). The carbamate fenobucarb was least effective. The biochemical resistance mechanisms were studied by using the crude homogenates of the resistant individuals of both insect adult stages, which had survived through the treatments by the LC50 values of the insecticides mentioned above. The in vitro studies resulted in insecticide degradation products. Insect mechanisms of resistance were investigated
Journal of Pest Control and Environmental Sciences
Volume 9, Issue 2
August 2001
Pages 1-14

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