Pheromone Trap Catches of Bean Webworm Pleuroptya ruralis （Lepidoptera,: Crambidae）in Soybean Fields and Colonies of Boehmeria silvestri

Abstract

To establish the forecasting used pheromone trap and analyze the ecology of Pleuroptya ruralis, pheromone trap catches of P. ruralis in the soybean fields and the colonies of Boehmeria silvestrii were compared with the beating method（counting the number of adult looking by beating on foodplants leaves）.In the soybean fields, the peak incidence of overwintering generation adults occurred clearer than beating method. In the one soybean field the pheromone trap catches and the number of beating method showed similar trends. But it was different in another field. The first generation adult catches emerged by soybean during mid-August to mid-September was very few compared with the beating method. This result suggests that the copulation activity of males are low. The pheromone trap catches in the colonies of B. silvestrii occurred in the mid-July, during mid-September to late October.