Abstract
Concentration-mortality studies with several populations of the Indianmeal moth, Plodia interpunctella (Hubner), and the almond moth, Ephestia cautella (Walker), were conducted with Bacillus thuringiensis subsp. kurstaki Berliner incorporated into a ground wheat diet. Indianmeal moth and almond moth populations differed as much as 6- and 10-fold, respectively, in responses to B. thuringiensis . The differences in both cases appeared to be related, in part, to population vigor. Midgut pH did not relate to population susceptibility in either species.
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