Interactive Effects of an Antifeedant Used with Bacillus thuringiensis var. san diego Delta Endotoxin on Colorado Potato Beetle (Coleoptera: Chrysomelidae

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The effects of citrus limonoid antifeedants used alone and in sequence with a Bacillus thuringiensis var. san diego delta endotoxin product against the Colorado potato beetle, Leptinotarsa decemlineata (Say), were examined in laboratory and field tests. In the laboratory, prior exposure to citrus limonoid did not alter Colorado potato beetle mortality in response to the endotoxin. Larval development time was significantly slower among larvae treated with limonoid or endotoxin; the most delayed development occurred among larvae receiving endotoxin following limonoid treatment. In field tests, rates of Colorado potato beetle adult colonization and oviposition were significantly lower in plots treated with endotoxin following treatment with limonoid compared with plots treated with either compound alone. Bioassays and chemical analyses of residues indicate that limonoids persist on potato foliage for ≍6-8 d under field conditions. The tests indicate that citrus limonoid antifeedants may be effectively used in conjunction with B. thuringiensis var. san diego endotoxin in an integrated approach to Colorado potato beetle management.

Document Type: Research Article

Publication date: December 1, 1993

More about this publication?
  • 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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