The spread and oviposition of Ophraella communa LeSage (Coleoptera Chrysomelidae) adults on Ambrosia artemisiifolia L. (Asterales: Asteraceae) were affected by wind direction. The densities of adults and eggs were the highest on plants located in the direction from which the wind blew. Our results suggest that oviposition preference of O. communa adults may be more dependent on the odors emitted by host plants than on their color.