Elm Volatiles Increase Attraction of Scolytus multistriatus (Coleoptera: Scolytidae) to Multilure 1

Abstract
Traps baited with multilure and bolts of healthy American elm, Ulmus americana , captured significantly more beetles than traps baited only with multilure. The elm bolt-multilure combination was two to three times as attractive as multilure and 4 to 18 times as attractive as elm bolts alone. The increased attraction from the presence of healthy elm tissue suggests that additional host volatiles, other than those formulated in multilure, contribute to the aggregation of beetles on host trees.