Estimation of Monitoring Range of Sex Pheromone Trap for the Rice Stem Borer Moth, Chilo suppressalis (WALKER) (Lepidoptera: Pyralidae) by Male Head Width Variation in Relation to Two Host Plants, Rice and Water Oats

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The monitoring range of a sex pheromone trap for the rice stem borer moth, Chilo suppressalis, was evaluated by the bimodal distributions of male moth head width. The distribution of male moth head width in both flight seasons was a combination of the two normal distributions. The larger one was shown to be from male moths that fed on water oats (Zizania latifolia) during the larval stage and the smaller one was that of males that fed on rice plants (Oryza sativa). Male moths emerging from water oats were caught by pheromone traps set at six locations near a water oats population (< 250 m) at a higher rate in the second flight season than in the first. The reverse relationship was observed at five other locations (> 250m). These results suggest that the monitoring range of a sex pheromone trap for this species is narrower in the second flight season than the first one, probably because of competition between wild virgin females and synthetic sex pheromone.
1995-08-25