Abstract
Mature pupae of Ephestia calidella (Guenée) were irradiated at doses of 200–1000 Gy. Variations in the percentage of adult emergence and percentage of malformed adults were used as criteria to evaluate the radiation effects. A dose of 1000 Gy prevented the emergence of both sexes. Females and males were sterilized with a dose of 350 and 400 Gy, respectively. Adult longevity and mating ability varied with regard to the dose. Males irradiated with sub-sterile doses (100, 150, and 200 Gy) were more sexually competitive with normal males than those irradiated with the sterilizing dose (400 Gy).
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