Pheromone interruption of pine engraver, Ips pini, by pheromones of mountain pine beetle, Dendroctonus ponderosae (Coleoptera: Scolytidae)
The effect of pheromones of Dendroctonus ponderosae Hopkins on the attraction of Ips pini (Say) to its pheromone, ipsdienol, was investigated in stands of lodgepole pine. The mixture of cis- and trans-verbenol significantly reduced catches of I. pini in traps baited with ipsdienol at three locations in British Columbia. exo-Brevicomin had no effect on catches of I. pini, irrespective of the enantiomeric composition of exo-brevicomin. Ipsdienol did not significantly reduce the attraction of D. ponderosae to traps baited with cis- and trans-verbenol, and (±)-exo-brevicomin.