The inherited sterility of the peach fruit-borer resulting from irradation.
In studies in Beijing, China, exposure of pupae of the apple pest Carposina niponensis Wlsm. 1-3 days before adult emergence to doses of 5-30 kR gamma radiation did not adversely affect the vigour or mating ability of the adults, but exposure to 30 kR resulted in sub-sterility (about 90%) in the males and almost complete sterility in the females. The vigour of the F1 generation was much reduced, and growth and development were retarded. Most larvae died before they had penetrated into the apples, and few completed their development to the adult stage. Though the lifespan and mating ability of the F1 adults were little different from those of the untreated controls, they were unable to reproduce.