Journal
REVISTA BRASILEIRA DE ENTOMOLOGIA
Volume 56, Issue 3, Pages 359-362Publisher
SOC BRASILEIRA ENTOMOLOGIA
DOI: 10.1590/S0085-56262012005000050
Keywords
Anticarsia gemmatalis; toxin; Cry1Ac; Dipel-resistant; strain
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Funding
- Embrapa Soja
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [304304/2008-5]
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Fitness cost of resistance to Bacillus thuringiensis in velvetbean caterpillar Anticarcia gemmatalis Hubner (Lepidoptera, Noctuidae). Selection pressure to obtain resistant genotypes can result in fitness cost. In this study, we report the effects of the selection pressure ora commercial formulation of Bacillus thuringiensis on biological aspects of a Dipel-resistant strain or velvetbean caterpillar, Anticarsia gemmatalis Hubner. Comparisons of Dipel-resistant and susceptible individuals revealed significant differences in pupal weight and larval development time. Both strains (Dipel-resistant and susceptible) were susceptible to Cry1Ac toxin expressed in foliar cotton tissues. Resistant and susceptible strains showed low survival rates of 22.5% and 51.2%. respectively, when fed with Greene diet containing Bt-cotton. Larvae bioassayed after three laboratory generations presented lower survival and less instar numbers than individuals maintained in the laboratory for more than 144 generations. Pupal weight was 9.4% lower and larval development time was 1.9 days longer in the resistant population than in the susceptible strain. Other parameters, such as duration of pupal stage, adult longevity, number of eggs per female, oviposition period, and egg fertility, remained unaffected.
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