Olfactory responses of the gypsy moth Lymantria dispar (L.) (Lepidoptera: Lymantriidae), a major defoliator of deciduous trees, were examined in Inner Mongolia, China. We studied whether the gypsy moth adults are attracted by the major volatile organic compounds (VOCs) of damaged Larix gmelinii (Dahurian larch) foliage and compared the attractiveness of the plant volatiles with that of the synthetic sex pheromone. Our results indicated that the VOCs of the Dahurian larch were effective in attracting gypsy moth males especially during the peak fl ight period. The VOCs also attracted moths signifi cantly better than the sex pheromone of the moth. Our study is the fi rst trial to show the responses of adult gypsy moths to volatile compounds emitted from a host plant. Electroantennogram responses of L. gmelinii volatiles on gypsy moths supported our fi eld observations. A synergistic effect between host plant volatiles and sex pheromone was also obvious, and bothcan be jointly applied as a new attractant method or population management strategy of the gypsy moth.

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