人工不妊昆虫の生態に関する研究

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タイトル別名
  • Studies on the Ecology of Insects Sterilized Artificially (Gamma Radiation)
  • ジンコウ フニン コンチュウ ノ セイタイ ニ カンスル ケンキュウ 3 137Cs ガンマセン ショウシャ ノ ハスモンヨトウ ニ タイスル フニン コウカ
  • III. Effects of <sup>137</sup>Cs on the Sterilities of <i>Spodoptera littoralis</i> (BOISD.)
  • III. <sup>137</sup>Cs γ線照射のハスモンヨトウに対する不妊効果

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The optimum dosage of 137Cs for sterilizing Spodoptera littoralis (BOISD.) and the most suitable stage for irradiation with gamma rays were examined. Five day old pupae seemed to be a suitable stage for irradiation. The optimum dosage for complete sterilization were 24Kr for males and 20Kr for females. The reduction in longevity of both sexes, irradiated at these dosages, was not significant and few adult deformities appeared. Next, sexual behaviour of adults and the alternate mating with a sterilized and untreated male to a normal female were investigated. A male could mate continuously with five virgin females during its life period. A female generally mated once again with the same male but it was sometimes observed that a female which had already mated once copulated again with other virgin males. Virgin females were mated first with males irradiated at 20Kr and five days later with normal males. The females produced almost no viable eggs until the subsequent mating with normal males, and after copulation with normal ones they produced, nevertheless, considerably few viable eggs as compared with that of the control. On the other hand, when virgin females were mated first with normal males and five days later with irradiated ones, they produced as many viable eggs as the control. Experiments on the mating competitiveness between males and females, both sterilized and normal ones, were conducted. When three irradiated males or two irradiated females were introduced into a confined population containing a normal male and female, the hatch percentages in eggs which were laid by a normal female were 1.3 or 1.9%, respectively. Introducing both irradiated male and female, it was 32.4%. Both the experimental values of 1.3 and 1.9% were considerably lower but that of 32.4% was higher than the theoretically estimated values.

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