irradiation did not appear to affect the mating activity of emerged moths as it happened in other Lepidoptera (Brower, 1979; Henneberry & Clayton, 1981). The mean number of eggs laid per control female did not differ significantly from the number laid by females mated either with maies from irradiated pupae or irradiated moths (table III). The number of eggs decreased continuously as gamma doses increased to reach less than 110 eggs per female at 30 Krads or higher doses. The fecundity of tobacco moths was also not affected significandy when the females mated with irradiated or non irradiated maies (Brower, 1979). The failure in progeny development reached 50 % of the control at 25 Krads or higher doses. This was observed when maies from irradiated pupae were crossed with normal females. The number of emerging larvae decreased to 20 % and 6 % at 25 and 50 Krads treatments, respectively (fig. F). Results on other Lepidoptera species showed a zéro hatch at 50 Krads treatment (Ahmed et al., 1976).
The effect of gamma rays on E. ceratoniae was similar to the effect on other Lepi- dopterous. It caused réduction in fertility egg when normal females mated with males ste- rilized at doses higher than 30 Krads (Proshold & Bartel, 1970; Henneberry & Clayton, 1981), and decreaseof the number of developed larvae (Brower, 1975, 1976; White, 1978).'
0 5 10 15 20 25 30 35 40 45 50
Gamma Dose (Krad.)
Fig. 1, effect of gamma-rays on egg hatch following irradiation of pupae or adult males of Ectomyelois cerato niae at the âges of (A) 3-4 days-old pupae, (B) 5-6 days-old pupae, and (C) one day old moths. (■ A , • : progeny developed to larvae, D, , O : undeveloped progeny, dotted line represents 50 of control development).
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