A STUDY ON CHANGES IN LARVAL AND PUPAL DENSITIES OF THE RICE STEM BORER, CHILO SUPPRESSALIS WALKER, IN ITS FIRST GENERATION

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  • OTAKE Akio
    Hokuriku Agricultural Experiment Station : Present address : Shikoku Agricultural Experiment Station

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  • 第1世代ニカメイチュウの幼虫およびさなぎ密度の変化に関する研究〔英文〕
  • ダイ1 セダイ ニカメイチュウ ノ ヨウチュウ オヨビ サナギ ミツド ノ ヘンカ ニ カンスル ケンキュウ エイブン

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Abstract

A population study of C. suppressalis was carried out at Takada, in 1954 and 1965,from June to August. In the former year, the main duration of larval hatching was comparatively short and, afterwards, the age constitutions of the borers changed rather regularly from young to old with the lapse of time. By following the analysis-of-variance procedures, it was clarified that larval density maintained unchanged for a month and this was succeeded by a drastical decline in the population. The year 1965 was characterized both by far lagged initiation of the infestation with the borer and by a remarkably low intensity of occurrence of the species. In this year, the maintenance of a stable larval density was also exhibited for a month but this was not succeeded by such a notable population decrease as seen in the previous year.

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