Journal of Economic Entomology (2006) 99, 946-953

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Yves Carrière, Megan E. Nyboer, Christa Ellers-Kirk, James Sollome, Nick Colletto, Larry Antilla, Timothy J. Dennehy, Robert T. Staten and Bruce E. Tabashnik (2006)
Effect of resistance to Bacillus thuringiensis cotton on pink bollworm (Lepidoptera: Gelechiidae) response to sex pheromone
Journal of Economic Entomology 99 (3), 946-953
Abstract: Fitness costs associated with resistance to transgenic crops producing toxins from Bacillus thuringiensis (Bt) could reduce male response to pheromone traps. Such costs would cause underestimation of resistance frequency if monitoring was based on analysis of males caught in pheromone traps. To develop a DNA-based resistance monitoring program for pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae), we compared the response to pheromone traps of males with and without cadherin alleles associated with resistance to Bt cotton (Gossypium hirsutum L.). When irradiated males from two hybrid laboratory strains with an intermediate frequency of resistance alleles were released in large field cages, the probability of capture in pheromone traps was not lower for males with resistance alleles than for males without resistance alleles. These results suggest that analysis of trapped males would not underestimate the frequency of resistance. As the time males spent in traps in the field increased from 3 to 15 d, the success of DNA amplification declined from 100 to 30%. Thus, the efficiency of a DNA-based resistance monitoring program would be improved by analyzing males remaining in traps for 3 d or less.
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Database assignments for author(s): Yves Carriere, Bruce E. Tabashnik

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Pectinophora gossypiella Cotton (Gossypium) U.S.A. (SW)
Bacillus thuringiensis genes in crops (entomopathogen) Pectinophora gossypiella Cotton (Gossypium) U.S.A. (SW)