Abstract
Sexually mature virgin female flour beetles, Tribolium castaneum (Herbst), mutant: sooty, were treated with dimethylsulfoxide (DMSO) and x-rayed. Fecundity, fertility and viability were measured. DMSO gave no radiation protection to female germ cells. Food containing 4.6% DMSO was unpalatable. Photomicrographs of ovarioles showed that sterility resulted because of oosorption. DMSO might be economically important in protecting stored products from insects.

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