Gamma Irradiation of the Melon Fly: Laboratory Studies of the Sexual Competitiveness of Flies Treated as Pupae 2 Days Before Eclosion or as 2-Day-Old Adults12

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Abstract
Gamma irradiation (6 krad 2 days before eclosion or 8 had 2 days after eclosion) induced 98–99% sterility in a laboratory strain of male Dacus cucurbitae Coquillett. Comparable females treated with 4 krad at the same ages were completely infecund. In trials with 5:1:1 ratios of sterile males-normal males-normal females, sexual competitiveness of males sterilized with 8 krad as 2-day-old adults was similar to that of males treated as pupae with 6 krad. The suppression of the fertility of normal flies by the introduction of sterile females was negligible.

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