温度および性比のちがいによるハスモンヨトウの産卵数とふ化率の変化

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In order to determine the effects of different conditions of temperatures and sex-ratios on the number of eggs laid and rate of egg hatching in Spodoptera litura, experiments were carried out in the laboratory and in a field plot which was covered with net. The number of eggs laid by a female per day was the largest on the first and second days after emergence and decreased gradually thereafter under the range of temperatures from 18 to 30℃. The temperature did not affect the total number of eggs laid during adult period and the rate of hatching of the eggs. It was shown from l_xm_x-curve that females laid almost all eggs by the seventh day after emergence under the range of temperatures studied. The number of egg masses laid by the unmated females was larger than that by the mated females, but the number of eggs laid by the former was much smaller than that laid by the latter. Laboratory experiments showed that both females and males mated only once or less during the first night. Males could mate at the same rate on the second night, but appeared to avoid the mating with the females which had mated already. As a result, the experiment in the laboratory showed that the rate of egg masses hatched, rate of egg hatching and the number of eggs laid reduced apparently with the decrease in the sex-ratio on the first day after emergence, but the tendency of reduction in these values decreased gradually on the second and the third days. In the experiment made in the field plot covered with nets, these values also reduced with the decrease in sex-ratio both on the first and second day and on the third day.
日本応用動物昆虫学会の論文
1973-12-25

温度および性比のちがいによるハスモンヨトウの産卵数とふ化率の変化

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