合成性フェロモンを利用したハスモンヨトウの大量誘殺法による防除　Ｉ　　サトイモ畑における幼虫コロニー密度の減少効果

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タイトル別名
  • Reduction of the Population Density of <i>Spodoptera litura</i> (F.) (Lepidoptera: Noctuidae) Using a Synthetic Sex Pheromone
  • ゴウセイセイ フェロモン オ リヨウシタ ハスモンヨトウ ノ タイリョウ ユウ
  • I. サトイモ畑における幼虫コロニー密度の減少効果

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A mass trapping experiment was conducted in a field of 27ha, in Kawagoe, Saitama Pref., in 1978. The following vegetables were cultivated in this field: 7ha of taro, 5ha of sweet potato, 10ha of carrot and 5ha of radish. Northern and southern margins of the field were surrounded by windbreaks while the other two sides were open. 52 dry type traps (made by Takeda Chemical Ind. Ltd.) baited with “litlure” (a synthesized sex pheromene for S. litura, which is a mixture of 4.55mg (Z, E)-9, 11-tetradecadienyl acetate and 0.45mg of (Z, E)-9, 12, tetradecadienyl acetate) were arranged in the experimental field in a grid-like pattern. Throughout the seasons (June to October), the number of males of S. litura captured in traps set in the inner part of the field was always lower than that in outer traps. The density of larval colonies on leaves of taro plants in the inner part of the experimental field also remained low until Sept. 18, but thereafter increased and became the density identical with in the outer part of the field. This reduction of larval density in the experimental field was also apparent when compared with the density in the control field (without trap).

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