Gamma Radiation Effects on Sitophilus zeamais and S. granarius12

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Abstract
The effects of gamma radiation on the maize weevil, Sitophilus zeamais Motschulsky, and the granary weevil, S. granarius (L.) were studied. All stages of these weevil were treated with 5, 10, 20, 30, 50, and 100 krad of gamma radiation from a 60CO source. Eggs and larvae of both species were unable to develop to the adult stage at any treatment level. The emergence of adults from irradiated pupae occurred with doses as high as 50 krad for S. zeamais and as high as 20 krad for S. granarius . A dose of 5 krad in the pupal stage of both species, however, was sufficient to cause sterility. The reproductive ability of irradiated adults was considerably reduced with 5 krad, and complete sterility occurred with 10 krad and above. Survival time of irradiated adults decreased with increasing dose.

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