The numbers and distributions of pine engraver,Ips pini(Say), predators, and secondary subcortical associates responding to racemic ipsdienol in Wisconsin were analyzed over 4 yr with regard to date, height in the canopy, and distance from the margin of previously killed trees. The largest difference in response patterns between predators andI. piniwas in seasonal occurrence. MostI. piniwere caught late in the season, whereas most predators were caught much earlier. Additional differences were observed in spatial distributions and time by space interactions. These results suggest that subtle behavioral or developmental (or both) shifts may allow some bark beetles to temporarily escape from predators that exploit scolytid pheromones as kairomones. Factors contributing to discrepancies between predator and prey trap catch can also be exploited in pest management. Semiochemically based control treatments can be scheduled to greatly reduce the proportion of beneficial insects caught without substantially reducing efficacy. Additionally, this information can be used to improve population estimates of predators and guide natural enemy introduction strategies.