Studies on the ecology of insects sterilised artificially (gamma radiation) . VIII. Experimental analysis of the sexual competitiveness between normal males of the oriental fruit fly and males sterilised by the 137Cs gamma radiation
Kiyoku, M.; Tsukuda, R.
Scientific Reports of the Faculty of Agriculture, Okayama University 44: 1-8
1974
Document Number: 476517
In this eighth part of a series from Japan [cf. preceding abstract], an account is given of laboratory tests in Japan on the sexual competitiveness of males of Dacus dorsalis Hend. sterilised by exposure to gamma -radiation from radioactive caesium (137Cs). Exposure of pupae two days before emergence to a dose of 7 kR resulted in at least 98.9% sterility, without significantly reducing the percentage emergence or life-span of adults. Dominant lethal factors were thought to be the cause of sterility. A mathematical technique for the calculation of sexual competitiveness is described.