Indianmeal•Moth (Lepidoptera: Pyralidae) Resistance to Different Strains and Mixtures of Bacillus thuringiensis

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The potential for Indianmeal moths, Plodia interpunctella (Hubner), to evolve resistance to isolates of Bacillus thuringiensis other than subsp. kurstaki HD-l was determined through laboratory selection experiments. Resistance developed quickly toward isolates HD-1l2 and HD-133 of subsp. aizawai and HD-198 of subsp. entomocidus, reaching levels of28, 61, and 21, respectively, after =20 generations of selection. However, the rates of progression were somewhat slower toward these isolates than toward HD-l, probably because of the different toxin composition of these other isolates. Simultaneous selection for resistance to a mixture of HD-l and HD-133 resulted in resistance to both isolates, but the rate toward the mixture was somewhat slower than that to the individual isolates. An insect population that was already resistant to isolate HD-l readily developed resistance to isolate HD-133 as well. The results demonstrate that mixtures of strains do not preclude the possibility of resistance and that their value in slowing resistance development may not be large.

Document Type: Research Article

Publication date: October 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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