Abstract
Modifications of the sterile-male release technique appear to offer promise for the control of post-harvest lepidopteran pest populations within storage structures. Theoretical models of release strategies for Cadra cautella ( Walker) showed that each method has an “ideal” flooding ratio. This ratio represents the best balance between extinction in a few generations and minimization of the total number of insects released. From data reported concerning the population dynamics of Cadra cautella in the field an ideal flooding ratio for fully sterile (S) males to fertile (F) males of 97:1 would achieve extinction in 3 generations. The ratio of partially sterile males released in alternate generations that would achieve extinction in 4 generations was 125:1, and the ratio of partially sterile males released every generation that would achieve extinction in 5 generations was 74:1. Total numbers of males released per 100 native insects (♂ + ♀) that would be needed to achieve extinction at these flooding ratios would be 14,850, 14,900 and 18,500, respectively.
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