ニカメイチュウの分散,分布の変化

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  • On the Distribution Pattern of the Rice Stem Borer in a Paddy-Field
  • ニカメイチュウ ノ ブンサン , ブンプ ノ ヘンカ

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The pattern of spatial distribution of the larvae of the rice stem borer, Chilo suppressalis WALKER was analysed statistically by using the data on the population censuses in the paddy-field of the Takawashi farm, the southern region in Osaka prefecture.<br>The fitness of the observed data to the theoretical distribution expected from the POISSON'S series was examined. The frequency distribution of number of larvae per hill of rice plant did not agree with the POLSSON'S series throughout the infant larval period, the young larval period and the full-grown larval period. The co-efficient of dispersion (s2/x……x: mean number of larvae on a hill of rice plant, s2: variance of it) changes in value remarkably with the growth of larvae. Namely, they changed 37.98, 10.89, 2.67 from the infant to the full-grown larval period.<br>By these facts, the following conclusion can bededuced that the distribution of this larva is not random in each growth period. Namely, each plant in the field shows differential attractiveness to the larvae. It is considered that the cause of such a difference among the plants is due to the complex, both the tendency of the insect itself and the heterogeneity of the environmental conditions.

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