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1 August 2005 Susceptibility of Dipel-Resistant and -Susceptible Ostrinia nubilalis (Lepidoptera: Crambidae) to Individual Bacillus thuringiensis Protoxins
Huarong Li, Brenda Oppert, Randall A. Higgins, Fangneng Huang, Lawrent L. Buschman, Kun yan Zhu
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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.

Huarong Li, Brenda Oppert, Randall A. Higgins, Fangneng Huang, Lawrent L. Buschman, and Kun yan Zhu "Susceptibility of Dipel-Resistant and -Susceptible Ostrinia nubilalis (Lepidoptera: Crambidae) to Individual Bacillus thuringiensis Protoxins," Journal of Economic Entomology 98(4), 1333-1340, (1 August 2005). https://doi.org/10.1603/0022-0493-98.4.1333
Received: 6 July 2004; Accepted: 1 May 2005; Published: 1 August 2005
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