Long-Range Migration as a Possible Factor Caused the Late-Summer Outbreak of the Oriental Armyworm, <i>Mythimna separata</i> WALKER, in Tohoku District, 1969

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  • 東北地方における1969年のアワヨトウ第2回多発生の原因に関する考察
  • トウホク チホウ ニ オケル 1969ネン ノ アワヨトウ ダイ 2カイ タ

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Abstract

In 1969 the early summer injury of the oriental armyworm, Mythimna separata WALKER, was negligible in Tohoku district, with the exception of a localized infestation on a pasture land, while the next generation insects caused severe damage to rice plants and a few other graminaceous crops extensively over the district in the late summer. It seems difficult to explain this extraordinary increase of the armyworm populations merely by the mutiplication of endemic populations. Examination of synoptic weather maps and wind records from the district during the critical oviposition period of the armyworm indicated that the moth immigration borne on a westerly wind was possible when an atomospheric depression rapidly moved from Kirin province of North China to northern Japan across the Japan Sea in late July. The supposition that the moth immigration occurred on this occasion was supported by baittrap catches of the adults in two localities. Distribution of the outbreak areas suggested that some of the immigrant moth-swarms invaded the eastern provinces across the lower parts of the central mountain-range.

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