北海道におけるインゲンマメゾウムシの野外寄生の確認と越冬場所の推定

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  • 岩崎 暁生
    北海道立総合研究機構中央農業試験場 現在：北海道立総合研究機構十勝農業試験場
  • 高林 透
    八紘学園北海道農業専門学校
  • 大沼 千佐子
    北海道胆振農業改良普及センター
  • 三宅 規文
    北海道立総合研究機構十勝農業試験場

書誌事項

タイトル別名
  • Confirmation of Field Oviposition of Bean Weevil, <i>Acanthoscelides obtectus</i>, on <i>Phaseolus vulgaris </i>and Estimation of Overwintering Place of the Pest in Hokkaido, Japan
  • ホッカイドウ ニ オケル インゲンマメゾウムシ ノ ヤガイ キセイ ノ カクニン ト エットウ バショ ノ スイテイ

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<p>In several kidney bean fields in Hokkaido, adult bean weevils, Acanthoscelides obtectus, were observed staying on nearly or fully mature pods in late July and early September. The weevils were discovered only in the vicinity（less than 100 m）of residential areas among the fields investigated. On the other hand,no weevils were discovered in farm areas more than 1 km away from nearby residential areas. No weevils emerged from infested seeds stored at 0℃ for more than 35 days or stored in unheated storehouses throughout winter. These suggest that the weevils can survive winter only in heated houses in Hokkaido,where winter is cold. 7.6% and 0.4% of kidney beans harvested from two fields in the Ishikari and Iburi districts, respectively, were infested. The numbers of exit holes per infested seed were 1-9 and 1-29, with averages of 3.9 and 5.4, respectively. In these fields, the oviposition periods estimated from the adult emergence and effective cumulative temperatures, 526.3 degree-days above developmental zero, 12.8℃,were from August 4 to September 1, and from August 4 to September 9, respectively.</p>

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