Response of Dendroctonus brevicomis and Ips paraconfusus (Coleoptera: Scolytidae) to combinations of synthetic pheromone attractants and inhibitors verbenone and ipsdienol
1991
Paine, T.D. | Hanlon, C.C.
Dendroctonus brevicomis and Ips paraconfusus are sympatric bark beetle species colonizing Pinus ponderosa in western North America. Interspecific and intraspecific competition for resources is, in part, mediated through semiochemicals. The response of D. brevicomis to its attractant pheromone was significantly reduced by simultaneous release of either verbenone or racemic ipsdienol. Trap catch was significantly further reduced by including both inhibitors with the attractant pheromones. However, although the response of Ips paraconfusus was significantly inhibited with the addition of either verbenone or racemic ipsdienol, both compounds together did not result in a significant further reduction in trap catch. There was a trend for greater reduction in response of D. brevicomis to attractant pheromones with increased release rates of either 69% (+)-/31% (-)-verbenone or 84% (-)-/16% (+)-verbenone. Response of associates to attractants and inhibitor combinations was also determined.
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