(9Z,12Z,15Z)-Octadecatrienal, a key sex pheromone component derived from the female gland of the fall webworm (Hyphantria cunea), must be blended with three other compounds—(9Z,12Z)-octadecadienal, (3Z,6Z,9S,10R)-9,10-epoxy-3,6-henicosadiene, and (3Z,6Z,9S,10R)-9,10-epoxy-1,3,6-henicosatriene—at a specific ratio (≈33.6:2:58.4:6) to form an effective lure for monitoring and controlling the Chinese population.