studies on the sterilization of egyptian cotton leaf worm Spodoptera Littoralis (Boisd.) in egypt

Full-grown male and female pupae of cotton leaf worm Spodoptera Littoralis (Boisd) were gamma irradiated with the doses of 100, 125 , 150 Gy; the fecundity decreased with the increase in dose. The reduction in egg hatch ability was significant at all tested doses. The percentage of mated females was not clearly affected. However, the reduction observed in either percentage of inseminated female or the average number of spermatophores per mated female was increased by increasing the dose to parental males and females.full grown male and female pupae were irradiated with the doses of 125, 150 Gy for male line and with 125 Gy for female line. the inherited effects of radiation on some biological aspects among irradiated P1 and their F1, F2 and F3 generations were studied. the data indicated that the fecundity of both normal females mated with irradiated males, and irradiated females mated with normal males decreased . almost proportionally with the increase in the dose, also, the percent egg hatch was significantly reduced by increasing the dose among P1,F1 and F2 generations. Gamma irradiation did not clearly affect the percentage of mated female in p1 and their three successive filial generations. however, the reduction was observed in the percentage of inseminated female . the average number of spermatophores per mated female was slightly affected among p1,F1,F2 and F3 at the majority of the tested mating combinations. the percentage of larval/pupal survival was obviously affected among F1 and F2 generations