The effects of substerilizing doses of gamma radiation on the longevity and level of inherited sterility in the Australian moth Teia anartoides Walker were determined. Six day-old male pupae were treated with 0, 100, and 160 Gy of gamma radiation by using a 1.25 MeV Cobalt⁶⁰ irradiation source. Laboratory studies of male longevity showed that radiation had little impact in adult moths of the P₁, F₁, and F₂ generations. Inherited deleterious effects resulting from irradiation were observed in the progeny of F₁ and F₂ generations. Outcrosses between substerile parental males or their highly sterile male progeny to wild-type females did not affect female fecundity. However, adverse effects were observed for these crosses in the rates of successful egg hatch and postembryonic development. Fertility was always greater in out-crosses involving a P₁ male than in any of the F₁ out-crosses. F₁ males were always more sterile than F₁ females, and the level of sterility for the F₁ and F₂ generations was higher than that of the controls. The incidence of larval and pupal mortality was higher in the F₂ than the F₁ generation. A dose of 100 Gy had the highest success in inducing deleterious effects that were inherited through to the F₂ generation. Our results indicated that the use of partially sterilizing doses of radiation has good potential as a selective strategy for management or eradication of T. anartoides.