Frequency of Alleles Conferring Resistance to a Bacillus thuringiensis Toxin in a Philippine Population of Scirpophaga incertulas (Lepidoptera: Pyralidae)

Authors: Bentur, J. S.; Andow, D. A.; Cohen, M. B.; Romena, A. M.; Gould, F.

Source: Journal of Economic Entomology, Volume 93, Number 5, October 2000 , pp. 1515-1521(7)

Publisher: Entomological Society of America

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Using the F2 screen methodology, we estimated the frequency of alleles conferring resistance to the Cry1Ab toxin of Bacillus thuringiensis Berliner in a Philippine population of the stem borer Scirpophaga incertulas (Walker). Evaluation of >450 isofemale lines for survival of F2 larvae on cry1Ab plants did not detect the presence of an allele conferring a high level of resistance. The frequency of such an allele in the sampled population was conservatively estimated to be <3.6 × 10−3 with 95% confidence and a detection probability of 94%. However, there was evidence of the presence of alleles conferring partial resistance to Cry1Ab. The frequency of alleles for partial resistance was estimated as 4.8 × 10−3 with a 95% CI between 1.3 × 10−3 and 1.04 × 10−2 and a detection probability of 94%. Our results suggest that the frequency of alleles conferring resistance to Cry1Ab in the population of S. incertulas sampled is not too high to preclude successful implementation of the high dose/refuge resistance management strategy.

Keywords: Bacillus thuringiensis; Bt resistance; Bt rice; F2 screen; Scirpophaga incertulas

Document Type: Research Article


Publication date: October 1, 2000

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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