Abstract: (-)-(1R,4aS,7S,7aR)-nepetalactol and (+)-(4aS,7S,7aR)-nepetalactone have been identified in sex pheromones released by a number of aphid species. From 19th to 28th,Oct.,1995, in a peach orchard experiment in Daxing county using white water traps of different ratios of the two components, 96% nepetalactone isolated from Nepeta cataria L.and 67% nepetalactol reduced from nepetalactone with diisobutylaluminium hydride,significantly more male Myzus persicae (Sulzer), male Hyaloptera amygdali Blanchard and gynoparae of M. persicae were caught in pheromone traps than in the control traps. Response of gynoparae was relatively weak than males.Male M. persicae were caught in significantly larger number in trap with ratio 1∶1 than others, and male H. amygdali were caught in significantly larger numbers by nepetalactol alone than by the other combinations.

Key words: sex pheromone, peach orchard, attraction, Myzus persicae, Hyaloptera amygdali