Abstract
ABSTRACTWhen newly emerged adult Dacus cucumis French were irradiated in nitrogen, following a 15 min exposure to an atmosphere of pure nitrogen, the degree of sterility induced by a given dose was less than that obtained with the same dose in air. To achieve sterility in males of approximately 98 per cent doses of 7 krad in air and 13 krad in nitrogen were required. With females, total sterility through infecundity was achieved by 6 krad in air and 13 krad in nitrogen. Based on the hatch of eggs from competitive mating tests, males receiving 14 krad in nitrogen were significantly more competitive than males given 9 krad in air. The optimal light intensity for mating of D. cucumis under artificial conditions was 16.2 1x. With this light intensity the mating propensity of males irradiated with 9 and 11 krad in air was significantly less than that of untreated males. The mating propensity of males given 14 krad in nitrogen approximated that of untreated males.
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