Inheritance of Resistance to Bacillus thuringiensis in Diamondback Moth (Lepidoptera: Plutellidae)

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We tested the offspring of various crosses of Plutella xylostella (L.) to determine the mode of inheritance of resistance to a commercial formulation of the microbial insecticide Bacillus thuringiensis. The progeny of reciprocal F 1 crosses (resistant male x susceptible female and resistant female x susceptible male) responded alike in bioassays, indicating autosomal inheritance. The LCso of F 1 progeny was not significantly greater than the LCso of a susceptible strain, showing that resistance was recessive. Responses of progeny from a backcross (FIX resistant strain) corresponded more closely to predictions from a single-locus model than to predictions from models with 2, 5, or 10 loci. Deviations between observed and expected outcomes increased as the number of loci in the model increased. Estimation of the minimum number of effective factors (sensu Lande 1981) also suggests that the number of loci influencing resistance was not large. In summary, our results suggest that resistance was controlled primarily by one or a few loci.

Document Type: Research Article

Publication date: August 1, 1992

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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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