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Larval survival and development of susceptible and resistant Ostrinia nubilalis (Lepidoptera: Pyralidae) on diet containing Bacillus thuringiensis

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1 Larval survival and development of Dipel-susceptible and -resistant strains of European corn borer, Ostrinia nubilalis (Hübner), were assayed using diets incorporating low doses of a commercial formulation of Bacillus thuringiensis var. kurstaki Berliner (Dipel ES).

2 Larval mortality, growth and development, pupation rate and pupal weight were not significantly different between Dipel-susceptible and -resistant strains when larvae were reared on a nontoxic control diet.

3 Larval mortality of Dipel-resistant larvae did not significantly change as Dipel concentration increased at the tested concentrations, whereas mortality of Dipel-susceptible larvae increased dramatically as Dipel concentration increased.

4 Larval development was significantly delayed when larvae were fed diets containing low doses of Dipel.

5 Pupation rate and pupal body weight declined as Dipel concentration increased but it decreased faster for the susceptible strain than for the resistant strain.
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Keywords: Bt-resistance; European corn borer; fitness of resistance; larval development

Document Type: Research Article

Affiliations: Department of Entomology, Kansas State University, Manhattan, KS 66506, U.S.A. and

Publication date: February 1, 2005

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