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Metepa sterilization of the olive fruit fly.

The effect of metepa on the longevity, fecundity, hatchability and embryonation of eggs, mating frequency, sperm depletion, and oviposition pattern of Dacus oleae (Gmelin) was studied. Various methods of sterilizing large numbers of captive flies were tested. One- and 5-day-old adult male and female flies were treated by contact with a thin film of metepa. Concentrations of 0.620 and 1.240 ml/m2 were each tested at contact times of 0.5, 1.3, and 5 min. Fecundity of normal females mated with treated males was not affected but that of treated females was significantly reduced. Hatchability of eggs laid by normal females mated with treated males was in all cases below 5%, whereas hatchability of eggs of treated females mated with normal males was below 47%. Embryo nation of eggs and longevity of treated insects were not affected. No recovery of treated insects was observed. Treated males mated as frequently as normal males, but sperm depletion was observed in treated males. Males mated normally after sperm depletion, and females mated with such males did not mate again when offered normal males. Fecundity of females mated with spermless males was reduced.