Pupae of the bean webworm, Pleuroptya ruralis, were collected from soybean fields in Toyama and Niigata, and the sex pheromone glands were removed from 24 virgin females that emerged from the pupae. The extract from sex pheromone glands was analyzed by GC-EAD and GC-MS, and then (E)- and (Z)-10-hexadenal were realized as candidates of the sex pheromones. Forty-five feral males were captured with a white sticky trap baited with an 84 : 16 mixture of (E)- and (Z)-10-hexedecenal from 14 to 29 July 2005 in Toyama. These results suggest that the mixture of aldehydes is a sex attractant of the bean webworm.
