Laboratory and Field Studies on Behaviouristic Reponse of the Minute Pine Bark Beetle, Cryphalus fulvus NIIJIMA (Coleoptera : Scolytidae) to the Female Pheromone : Ecological studies on the minute pine bark beetle (Part 1).

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Basic studies on the minute pine bark beetle, Cryphalus fulvus NIIJIMA, a species attacking the Japanese red-pine, Pinus derstflora SIEB. et ZUCC., were conducted under both laboratory and field conditions, using the bait traps.Traps with the virgin fermale-infested logs are strongly attractive to newly emerged beetles of both sexes. After emergence, the females disperse flight and attack hosts as pioneers. Mass attack flight then occurs in response to the species-specific pheromone produced by the invasion of pioneers. The maximum response to the trap is achieved between the third and fifth day after the introduction of females into the log. The response flight is influenced by temperature and wind. With an increase in wind speeds, the dispersal flight is directed toward the inside of forest stands. Diurnal patterns in response to the trap and of emergence of the beetles are similar in general form, having a single peak in the late afternoon when the environmental factors are favorable.The female produces a population aggregation pheromone that both attracts and arrests the adult beetles.
日本応用動物昆虫学会の論文
1973-09-25