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Selection and Reversion of Azamethiphos-Resistance in a Field Population of the Housefly Musca domestica (Diptera: Muscidae), and the Underlying Biochemical Mechanisms

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The organophosphorus insecticide, azamethiphos, is widely used throughout the world to control the housefly, Musca domestica (L.). Since its commercial introduction to Denmark in 1983 for this purpose, we have monitored the toxicity of azamethiphos to housefly populations at livestock farms throughout the country and carried out regular field studies. The findings of our field studies, which have revealed a strong potential for resistance development, have been born out by regular surveys showing that resistance has increased in recent years. Through the analysis of a field derived laboratory strain, we have implicated oxidative and hydrolytic mechanisms together with altered acetylcholinesterase in this resistance. Our field and laboratory studies have also indicated that resistance is relatively unstable, and can revert in the absence of selection. The implications of our findings for the continued efficacy of azamethiphos are discussed.
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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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