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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.