Effects of Gamma Radiation on Rhyzopertha dominica, Sitophilus oryzae, Tribolium confusum, and Lasioderma serricorne

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Abstract
Lesser grain borers, Rhyzopertha dominica (F.); confused flour beetles, Tribolium confusum Jacquelin duVal; rice weevils, Sitophilus oryzae (L.); and cigarette beetles, Lasioderma serricorne (F.), were exposed to various levels of gamma radiation from a Co60 source. All 4 metamorphic stages of each insect were used. Dosages were 13.2±10%, 17.5, 25, 45, and 100 krad and, on all insects except the lesser grain borer, a fractionated dosage of 13.2 krad ±10% repeated 5 times at hourly intervals. The dose rate for all treatment levels was about 330 krad per hour. In all species the adults were the most tolerant, followed by the pupae, then the larvae, and then the eggs. No dosage used was high enough to produce immediate complete mortality of all species. All 4 species were sterilized by gamma radiation in a single continuous dose of 25 had or more.

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