ノシメコクガ<i>Plodia interpunctella</i> HÜBNERの生態学的生活史の研究

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タイトル別名
  • Studies on the Ecological Life History of the Indian-Meal Moth, <i>Plodia interpunctella</i> HÜBNER
  • ノシメコクガ Plodia interpunctella H. ノ セイタイガクテキ セイカツシ ノ ケンキュウ エイブン 1
  • I. Comparative Studies of the Three Stocks with Special Reference to the Onset of Diapause
  • I. 休眠生起についての3ストックの比較

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There was a reduction in the number of density-dependent diapause individuals in the original stock of Plodia interpunctella HÜBNER reared at 30°C. The percentage of density-dependent diapause decreased from 23.7% to 0.6% during three years from 1956 to 1959 (tested in the condition of 400 eggs per 30g rice bran at 30°C), whereas all or nearly all of the larvae entered diapause when they were reared at 20°C (OS).<br>On the other hand, by repeated breeding from the moths which emerged relatively early at a temperature of 20°C, a new stock was evolved that pupated without any interruption even under this temperature condition. This stock was also not so sensitive to larval density, showing 0.4% diapause in the condition of 400 eggs per 30g rice bran at 30°C (NS).<br>By the same handling method as in NS and by selecting in the opposite direction, another new stock was evolved that produced little or no diapause-free individuals in every generation at 20°C. This stock showed a marked sensibility as regards the effect of high larval density of 400 eggs per 30g rice bran at 30°C, resulting in 52.4% diapause (DS).<br>All the larvae of the three stocks entered diapause if they were reared at 30°C up to the middle instar stage, at which they were removed to 20°C. No larvae of the three stocks entered diapause when they were reared in a condition of low larval density at 30°C.<br>The significance of the results reported in this paper is that the flexibility in the character of diapause has been shown not only in the response to density independent factor but also in the mode of density response itself.

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