Effects of Wind Velocity on the Catchability of a Sex-Pheromone Trap for the Common Cutworm, Spodoptera litura (FABRICIUS)

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  • 性フェロモントラップによるハスモンヨトウ雄成虫の捕獲に対する風速の影響
  • セイ フェロモントラップ ニ ヨル ハスモンヨトウ オス セイチュウ ノ ホカク ニ タイスル フウソク ノ エイキョウ

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The relationship between the number of male Spodoptera litura caught by a pheromone trap and the hourly mean wind velocity was studied for four months in the field using an automatic counting system. The maximum number of males trapped per hour was observed at wind velocities of 1-4 m/sec. Slightly fewer male moths were trapped when the wind blews strong, although more than 60 males/trap/h were still caught during the daily peak hours (0200-0400h) during very strong wind blews, when a typhoon was approaching. In order to monitor the field occurrence of the adult moth using pheromone traps, the mating activity of the moth and the numbers of males may be more important factors than wind velocity. Key words: automatic counting system, sex pheromone trap, Spodoptera litura, typhoon,

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