Larval survival and development of susceptible and resistant Ostrinia nubilalis (Lepidoptera: Pyralidae) on diet containing Bacillus thuringiensis |
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Authors: | Fangneng Huang† Lawrent L Buschman Randall A Higgins |
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Institution: | Department of Entomology, Kansas State University, Manhattan, KS 66506, U.S.A. and; Department of Entomology, LSU AgCenter, Louisiana State University, Baton Rouge, LA 70803, U.S.A. |
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Abstract: | Abstract 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 |
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