Four populations of Tribolium castaneum (Herbst) and of Sitophilus oryzae (L.) were treated with 0 (control), 0·5, 1 or 2 krad of gamma radiation for 7 and 5 successive generations, respectively, and the adults from the subsequent unirradiated generation of each population were checked for fecundity. Groups of 6th generation T. castaneum and S. oryzae adults from each population were tested for resistance to acute radiation by exposure to doses of 16 and 50 krad followed by a check for mortality. No evidence of increased resistance to acute radiation exposures was found. Irradiated T. castaneum populations did not show significant decreases in mean survival time, but some significant decreases in life-span of irradiated S. oryzae populations were found. Fecundity of the 8th generation 0·5 krad T. castaneum was greater than that of the control population, but 1- and 2-krad populations did not show any difference in fecundity. Fecundity of the 6th generation S. oryzae population was not significantly different from that of the control, but 1- and 2-krad populations had significantly reduced fecundities. The test results indicated that possible accidental exposure of some insects to substerilizing doses during commercial radiation disinfestation is unlikely to bring about the development of radiation-resistant insect populations. © 1973.
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