Gamma Irradiation of Adult Plodia inter punctella: 1 Effects on Mating, Sterility, and Number of Progeny

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Abstract
Irradiation of 24-h-old adults of Plodia interpunctella (Hübner) did not significantly decrease the mating ability of males or females except at doses of 75–100 krad, but it increased mating frequency in females treated with 20–50 krad. The number of adult progeny per fertile pair and the percentage sterility were correlated with dose. The doses required to sterilize 50% of the males and females were 42.5 and 27.0 krad, respectively; the doses required for 99% sterility were 67.0 and 45.0 krad, respectively. The decreased number of progeny per fertile pair and the increased percentage of sterility combined to produce severe decreases in reproductive capacity. Although males appeared to be much more radioresistant than females, the proportionate decrease in reproductive capacities was nearly identical at the same doses. Thus the spermatozoa and oöcytes were apparently equally sensitive to the induction of dominant lethal mutations, but the much greater number of male gametes prevented sterilization of the male except at higher doses.

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