Journal of Economic Entomology (2005) 98, 1333-1340
Huarong Li, Brenda Oppert, Randall A. Higgins, Fangneng Huang, Lawrent L. Buschman and Kun Yan Zhu (2005)
Susceptibility of dipel-resistant and -susceptible Ostrinia nubilalis (Lepidoptera: Crambidae) to individual Bacillus thuringiensis protoxins
Journal of Economic Entomology 98 (4), 1333-1340
Abstract: Dipel-resistant and -susceptible strains of Ostrinia nubilalis (Hübner) were evaluated for larval mortality and growth inhibition when fed diets containing individual Bacillus thuringiensis protoxins. Resistance ratios for four of the protoxins in Dipel (Cry1Aa, Cry1Ab, Cry1Ac, and Cry2Aa) were 170-, 205-, 524-, and >640-fold, respectively, considerably higher than the 47-fold resistance to Dipel. The Dipel-resistant strain was 36-fold resistant to Cry1Ba, a protoxin not present in Dipel. Another non-Dipel protoxin, Cry1Ca, did not cause significant mortality for either resistant or susceptible larvae with doses as high as 1.0 mg/ml. In an evaluation of larval growth inhibition, resistance to Cry1Aa, Cry1Ab, Cry1Ac, and Cry1Ba was significant at concentrations of 0.054 and 0.162 µg/ml. However, growth inhibition with Cry2Aa was not significant at either dose. These data provide information on the spectrum of resistance and cross-resistance to individual Cry protoxins in this strain.
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Link to article at publishers website
Database assignments for author(s): Fang Neng Huang, Kun Yan Zhu, Brenda Oppert, Lawrent L. Buschman
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.
|
|---|---|---|---|---|
| Ostrinia nubilalis | ||||
| Bacillus thuringiensis Cry1A-toxin (entomopathogen) | Ostrinia nubilalis | |||
| Bacillus thuringiensis Cry1B-toxin (entomopathogen) | Ostrinia nubilalis | |||
| Bacillus thuringiensis Cry2A-toxin (entomopathogen) | Ostrinia nubilalis |
