Feeding Behavior of CryIIIA-Resistant and Susceptible Colorado Potato Beetle (Cole opera: Chrysomelidae) Larvae on Bacillus thuringiensis tenebrionis-Transonic CryIIIA-Treated and Untreated Potato Foliage

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Behavior of Bacillus thuringiensis tenebrionis-resistant and -susceptible Colorado potato beetle, Leptinotarsa decemlineata (Say), larvae on cryIIIA-treated, B. thuringiensis tenebrionis-transgenic, and untreated foliage was quantified. The behavior of resistant larvae was not affected by cryIIIA on treated leaves. Susceptible larvae exposed to cryIIIA-treated foliage spent =2% of the time feeding, whereas susceptible larvae on untreated foliage spent 28% of the time feeding. Resting time for susceptible larvae on cryIIIA-treated foliage was nearly double resting time on untreated foliage. On cryIIIA-treated foliage, resistant larvae spent 11% of the time feeding, significantly longer than for susceptible larvae. The behavior of both resistant and susceptible larvae on B. thuringiensis tenebrionis-transgenic leaves was similar to that of susceptible larvae on cryIIIA-treated leaves. Larval position on the upper versus lower surfaces of leaves was not affected by B. thuringiensis tenebrionis, and did not differ between resistant and susceptible strains. Our results suggest that larvae resistant to formulated B. thuringiensis tenebrionis insecticides may remain susceptible to B. thuringiensis tenebrionis-transgenic plants that express high concentrations of toxin.

Document Type: Research Article

Publication date: April 1, 1996

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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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