ニカメイチュウの卵塊性幼虫集団に関する生態学的研究

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  • Ecological Study on the Larval Colony Hatched from an Egg Mass of the Rice Stem Borer
  • ニカメイチュウ ノ ランカイセイ ヨウチュウ シュウダン ニ カンスル セイタイガクテキ ケンキュウ

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The larvae of the rice stem borer, Chilo suppressalis, hatched from an egg mass show clumped distribution in a paddy field. The degree of clumping is determined by the size of the larvai colony hatched from an egg mass. The authors studied the characteristics of the larval colony in a paddy field of the university farm at Takatuki (2nd generation) and the farm of our laboratory (1st generation) from 1960 to 1961.<br>2nd generation<br>For the duration of 10 days after hatching, most of the hatched larvae form a colony in the stalk on which an egg mass was set. As the mortality of the hatched larvae in the small larval colony was high and vice versa, there was a positive correlation between the size of larval colony and the percentage of the survival of larvae before larval dispersion.<br>The larvae began to disperse actively about 15 days after hatching. The rate of dispersion and mortality in the large larval colony was higher than that in the small one. Therefore, the correlation mentioned above disappered gradually with the days after larval dispersion.<br>1st generation<br>The rice plant at this period was not enough to support the larval growth. At the young larvalstages, in 3 and 8 days after hatching, the mortality of the hatched larvae was very high in any size of the larval colony. So, there seemed to be no correlation between the size of larval colony and the percentage of the survival of larvae.

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