Active Space of Sex Pheromone of the Diamondback Moth, <i>Plutella xylostella</i> (L.) (Lepidoptera: Yponomeutidae)

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  • ISHII Toshihiko
    Faculty of Agriculture, Tokyo University of Agriculture and Technology Osaka Branch Office, Tomono Noyaku Co., Ltd.
  • NAKAMURA Kazuo
    Division of Entomology, National Institute of Agricultural Sciences Central Agricultural Experiment Station
  • KAWASAKI Kenjiro
    Division of Entomology, National Institute of Agricultural Sciences
  • NEMOTO Hisashi
    Saitama Horticultural Experiment Station
  • TAKAHASHI Kenichi
    Saitama Horticultural Experiment Station
  • KUBOTA Atsuo
    Saitama Horticultural Experiment Station

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Other Title
  • コナガの性フェロモンの有効範囲
  • コナガ ノ セイ フェロモン ノ ユウコウ ハンイ

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Description

Adult males of the diamondback moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae) which had been marked were released at several points located at various distances from a pheromone trap. Two kinds of lure sources were used in the traps: i.e., virgin females and the synthetic sex pheromone consisting of a mixture of 0.05mg of (Z)-11 hexadecenal with 0.05mg of (Z)-11 hexadecenyl acetate and 0.001mg of (Z)-11 hexadecenol, which impregnated a rubber dispenser. The captures in the trap from each release point were analyzed using a simulation model for the male orientation process to the pheromone source. As a result, the maximum distance downwind of the active space was estimated at 0.6-0.9m, and this value did not differ between the two kinds of attractants. The ratio of males captured in the trap to those entering the active space (attraction rate of the trap) was estimated by comparing experimental and simulation results. Attraction rate which was less than 30% increased with the increase in wind velocity.<br>In another experiment, males were placed at several points located of various distances from the pheromone source and the number of males taking off and flying upwind was counted 5 min after their release. These behaviours were induced significantly at high rate for a distance of 1-2m downwind from the pheromone source. It is considered that this distance coincides with the active space of the pheromone estimated by means of the release-recapture of males.

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