Substerilizing Irradiation of Plodia interpunctella1 Males: Effects on Three Filial Generations

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Abstract
One-day-old males of the Indian meal moth, Plodia interpunctella (Hübner), were treated with 5, 10, or 15 krad of gamma radiation and paired with untreated virgin females. Progeny were collected through 3 generations (F1, F2, and F3), lines were established with all degrees of inbreeding and outbreeding, and effects were assayed by determining sterility and the average number of progeny produced by males, females, or pairs from each line. Results showed that the greater the initial dose, the greater the reduction in the number of progeny and the longer the population depression persisted. Both males and females of the F1, were more affected than P1, males, though F1 males were much more affected than F1 females. Recovery of reproductive ability began in the F2 generation and continued into the F3 generation. Each generation of males proved to be more affected than the corresponding females when the sexes were outcrossed with untreated moths. The greater the degree of inbreeding for radiation, the greater the effect on both males and females and the longer the effects persisted. Although radiation produced a high degree of control only in the F1, generation and at the highest dose, sufficient depression accompanied inbreeding at the lower doses to reduce abundance of a natural population for several generations after a single mass release of substerilized males.

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