(Z)-2-(3,3-Dimethylcyclohexylidene)ethanol serves as a critical synergist in the aggregation pheromone system of the western pine beetle (Dendroctonus brevicomis). When combined with exo-brevicomin and the host terpene myrcene, it forms a potent lure for mass trapping. Field trials demonstrate that this blend increases capture rates by 2-3 times compared to single components, enabling precise monitoring and suppression of beetle outbreaks in coniferous forests.