No abstract

Experiments were carried out to study the effect of sublethal doses of gamma radiation (10-100 krad) on fecundity, longevity and sterility of adults of Sitotroga cerealella. The results indicate that fecundity of females decreased as the dosage increased from 10-90 krad. At 100 krad no eggs were deposited. Raising the dose to 100 krad resulted in shortening the longevity to about half the longevity of the untreated moths. When irradiated females mated with similarly irradiated males, a dosage of 20 krad caused 97.17% sterility. A dose of 28 krad induced 96.69% sterility when normal females were mated with irradiated males, while 94.14% sterility resulted when normal males were mated with irradiated females.

No abstract

The susceptibility of the different stages of Sitotroga cerealella (Olivier) to gamma radiation was studied. The stages arranged in a descending order according to the values of gamma radiation LD 50 are: adults (190.100krad for females and 183.200 krad for males, pupae (6.039 krad), 3 days old eggs (5.570 krad), one week old larvae (4.800 krad), 1-day-old eggs (4.181 krad) and 2 weeks old larvae (3.056 krad).Resume-La sensibilite des differents stades de Sitotroga cerealella (Olivier) aux radiations gamma a ete etudiee. La sensibilite des insectes exprimee par Krad correspondant a la DL 50 varie suivant les stades: Adultes (190.100 krad) pour les femelles, (183.200 krad) pour les males; chrysalides (6.039 krad); oeufs de 3 jours (5.570 krad); larves agees d'une semaine (4.800 krad); oeufs d'un jour (4.181 krad); larves agees de deux semaines (3.056 krad).

No abstract