Effects of Gamma Radiation on the Fertility of the Two-Spotted Spider Mite and Its Progeny

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Abstract
Females of the two-spotted spider mite, Tetranychus telarius (L.), mated to gamma-irradiated males produced fewer female progeny and more nonviable eggs as the dosage of radiation increased. At a dosage of 32 kr there were male progeny and nonviable eggs but no female progeny. Virgin females exposed to gamma radiation and mated to untreated males produced fewer males and females as the dosage increased from 1 to 24 kr, and after exposure to 32 kr produced only nonviable eggs. Surviving female progeny of males irradiated at 8 kr or more were incapable of reproduction, and female progeny of males irradiated at 2 or 4 kr produced fewer males and females and more nonviable eggs than female progeny of untreated parents. Evidence for sperm inactivation or death was observed at doses of 96 kr and above.

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