Centrifugal Progress of Outbreaks of the Rice Stem Borer, <i>Chilo suppressalis</i>

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  • KIRITANI Keizi
    Asso Research Station, Wakayama Agricultural Experiment Station
  • OHO Nobuhiko
    Asso Research Station, Wakayama Agricultural Experiment Station National Horticultural Experiment Station

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Other Title
  • ニカメイチュウの大発生において見られた大発生年の遠心的ずれと地域的広がり
  • ニカメイチュウ ノ ダイ ハッセイ ニ オイテ ミラレタ ダイ ハッセイネン ノ エンシンテキズレ ト チイキテキ ヒロガリ エイブン

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Description

Analysis of records of annual catch of moths in light traps of the rice stem borer, Chilo suppressalis, during the 1953 outbreak in Kyûsyû Island reveals that the occurrence of outbreak year of different observatory stations delayed in time and shows a spacial limitation in its extention of infestation.<br>The 1953 outbreak is supposed to be originated initially at the central zone of Saga Plane and spread in centrifugal manner covering the coastal zone of Ariake Sea and ended in 1956.<br>It was observed in most of the stations that the 1953 outbreak accompanied with significantly high value of sex ratio lasted at least for two consecutive generetions, but it can not be decided whether the high sex ratio is an immediate cause of inducing outbreak or a resultant phenomenon of outbreak.<br>Mass emigration of larvae was observed at Saga in the late fall in 1952, and feeding on unusual host plants was also occurred at the larval mass emigration.

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