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Teflubenzuron Resistance in Diamondback Moth (Lepidoptera: Plutellidae)

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Laboratory selection of susceptible and field strains of diamondback moth, Plutella xylostella (L.), larvae for 20 generations or more resulted in only 8-12-fold resistance to teflubenzuron, a benzoylphenylurea (BPU) that interferes with chitin synthesis. Cross-resistance with another BPU, chlorfluazuron, or a number of conventional insecticides was not apparent. Selection of larvae with teflubenzuron caused the diamondback moth to develop considerable resistance to the ovicidal effect of this compound. Piperonyl butoxide, an inhibitor of microsomal oxidases, restored the effectiveness of teflubenzuron against larvae and eggs of the selected strains, indicating that microsomal oxidation was the major resistance mechanism. Larvae selected with teflubenzuron exhibited much higher aldrin epoxidase and aryl hydrocarbon hydroxylase activities than those of the susceptible and field strains. Lack of cross-resistance between conventional insecticides and teflubenzuron-chlorfluazuron, and between teflubenzuron and chlorfluazuron suggested that different microsomal oxidases in diamondback moth might be involved.

Document Type: Research Article

Publication date: October 1, 1988

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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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