Effect of a Barrier with Lapel-shaped Folded Structure on the Reduced Dispersion of Scepticus griseus Adults

Abstract

We investigated the effect of a barrier with lapel-shaped folded structure on reducing dispersion of Scepticus griseus (Coleoptera: Curculionidae) adults, in order to establish a method for reducing their invasion to crop fields. In double-framed field plots, we installed an inner frame with or without a lapel-shaped folded structure facing outward at 40°to the vertical surface. The weevil adults were released between the inner frame and the outer frame then investigated after a certain period of time. Invasion into the inner frame with the lapel-shaped folded structure was significantly reduced compared to the inner frame without it, indicating that the barrier with a lapel-shaped folded structure is promising as a physical control method to reduce migration of this weevil.