Abstract
Gamma irradiation of ♂ pupae and adults of Spodoptera exigua (Hübner) with 15 or 20 krad did not affect in longevity and mating of either the P1 or F1 generations. When P1 males, irradiated as pupae or adults, or their F1 progeny were crossed with untreated moths, the percentages of egg hatch and yields of F1 adults of norma appearance were higher with the 15 krad than with the 20 krad treatment. However, a model appraising the impact of a single release of such treated males (9:1 ratio of sterile to untreated) in suppressing a population indicated that all treatments could have a comparable effect if it is assumed that both types of irradiated P1 males and their F1 ♂ progeny are equally competitive. Therefore, irradiation of pupae would be the method of choice because less space, time, and equipment are needed for storage, handling, feeding, and irradiation.
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