ノシメコクガの休眠に関する研究

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タイトル別名
  • Studies on the Diapause of the Indian-Meal Moth, <i>Plodia interpunctella</i> HÜBNER
  • ノシメコクガ ノ キュウミン ニ カンスル ケンキュウ 3
  • III. The Influence of High Temperature on the Inception of Diapause in the 20°C Non-Diapause Stock
  • III. 休眠性の弱い個体を休眠に入れる条件としての高温

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抄録

When the normal stock of Indian-meal moth, Plodia interpunctella HÜBNER, is reared at about 20°C, all the larvae enter diapause at the fully grown stage and their pupation is interrupted for a long period of time. The diapaused larvae, however, pupate at last and emerge into adults.<br>On the other hand, by repeated breeding from the moths which emerged relatively early at a temperature of 20°C at which diapause is induced, a new stock is evolved that pupates without any interruption even under this temperature condition.<br>The present paper is devoted primarily to a study of the effect of high temperature on the incidence of diapause in this non-diapause stock.<br>In this stock, diapause was induced in fully grown larvae reared at about 20°C when they had been exposed to 30° for some time (2∼8 or 12 days) in the early stages (egg∼2nd instar), but the diapaused larvae pupated at last and emerged into adults like in the normal stock. In this case, however, the larvae of the next generation did not enter diapause so far as they were under the temperature condition of 20°C throughout their developmental stages.<br>The exposure of individuals to 30°C during one generation (from the egg to the adult stage) had no effect on the induction of diapause in the larvae of the next generation reared at about 20°C, whereas the effect of exposure to 30°C throughout two or more generations remains unknown.

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