Dose-dependent and Species-specific Responses of Pine Bark Beetles (coleoptera: Scolytidae) to Monoterpenes in Association with Pheromones

The Canadian Entomologist 132: 183 195 (2000) Monoterpenes affected the attraction of three sympatric species of bark beetles (Coleoptera: Scolytidae) to pheromone-baited multiple-funnel traps in stands of lodgepole pine. Catches of Ips pini (Say) in traps baited with its pheromone, ipsdienol, were directly related to the release rates of 3-carene, pphellandrene, and ppinene. Catches of Dendroctonus ponderosae Hopkins in traps baited with exo-brevicomin and cisand trans-verbenol were directly related to the release rates of 3-carene, myrcene, and pphellandrene. Zps Zatidens (LeConte) exhibited preferences for traps baited with ipsenol and Pphellandrene or P-pinene but not in a dose-dependent fashion. Catches of I. latidens in traps baited with its pheromone, ipsenol, were inversely proportional to the release rates of 3-carene, myrcene, and terpinolene. Similarly, catches of I. pini in traps baited with its pheromone, ipsdienol, were inversely proportional to the release rates of myrcene and terpinolene. These results demonstrate a degree of species specificity among three phloeophagous species with respect to preferred host odours. The bark beetle predators-associates Lusconotus complex LeConte (Coleoptera: Colydiidae) and Corticeus Piller and Mitterpacher sp. (Coleoptera: Tenebrionidae) demonstrated some measure of specificity to monoterpenes in their responses to ipsdienol-baited funnel traps. y-Terpinene increased attraction of L. complex but had no effect on Corticeus sp., whereas aand bpinene increased attraction of Corticeus sp. but had no effect on L. complex. Miller DR, Borden JH. 2000. RCactions specifiques & la dose et ?I l’esp&ce chez des scolytes des pins (Coleoptera; Scolytidae) mis en prtsence de monoterp&nes combin& a des phiromones. The Canadian Entomologist 132 : 183-195.