Numbers of Scolytus multistriatus (Coleoptera: Scolytidae) Caught on Multilure-Baited Sticky Traps Increase with Methoxychlor1

Abstract

Multilure-baited sticky traps were attached to various methoxychlor-sprayed and unsprayed trap sites to determine the effect of the insecticide treatments on catches of the smaller European elm bark beetle, Scolytus multistriatus (Marsham). Significantly more bark beetles were captured by baited sticky traps attached to the boles of sprayed healthy American elms, Ulmus americana L., and also by traps attached to the boles of sprayed elms infected with the Dutch elm disease fungus, than were captured by traps on comparable unsprayed elms. Bark beetle catches on traps attached to sprayed and unsprayed utility poles and tree trap sites other than elms were not significantly different. These tests suggest that other beetle attractants associated with healthy and diseased elms and the presence of methoxychlor on the trap sites significantly affected trap catches.