Dose-dependent and species-specific responses of pine bark beetles (Coleoptera : Scolytidae) to monoterpenes in association with pheromones

Monoterpenes affected the attraction of three sympatric species of bark bee tles (Coleoptera: Scolytidae) to pheromone-baited multiple-funnel traps in stands of lodgepole pine. Catches of Ips pini (Say) in traps baited with it s pheromone, ipsdienol, were directly related to the release rates of 3-car ene, beta-phellandrene, and beta-pinene. Catches of Dendroctonus ponderosae Hopkins in traps baited with exo-brevicomin and cis- and trans-verbenol we re directly related to the release rates of 3-carene, myrcene, and beta-phe llandrene. Ips latidens (LeConte) exhibited preferences for traps baited wi th ipsenol and beta-phellandrene or beta-pinene but not in a dose-dependent fashion. Catches of I. latidens in traps baited with its pheromone, ipseno l, were inversely proportional to the release rates of 3-carene, myrcene, a nd terpinolene. Similarly, catches of I. pini in traps baited with its pher omone, ipsdienol, were inversely proportional to the release rates of myrce ne and terpinolene. These results demonstrate a degree of species specifici ty among three phloeophagous species with respect to preferred host odours. The bark beetle predators-associates Lasconotus complex LeConte (Coleopter a: Colydiidae) and Corticeus Piller and Mitterpacher sp. (Coleoptera: Teneb rionidae) demonstrated some measure of specificity to monoterpenes in their responses to ipsdienol-baited funnel traps, gamma-Terpinene increased attr action of L. complex but had no effect on Corticeus sp., whereas alpha- and beta-pinene increased attraction of Corticeus sp. but had no effect on L. complex.