Parasitism of Scolytus multistriatus (Marsham) (Coleoptera: Curculionidae: Scolytinae) in an ornamental planting of Frontier elm in Lewiston, ID

摘要

Specimens of S. multistriatus (3), Dendrosoter protuberans (40), Cheiropachus quadrum (62), Rhaphitelus maculatus (28) and Neoclytus acuminatus (one) emerged from 2 sections of a bole of a single, ten-year-old Frontier elm (Ulmus carpinifolia [U. minor] × U. parvifolia) collected on 28 October 2008 in Lewiston, Idaho, USA. Two additional S. multistriatus adults were found under the bark during subsequent dissections. The specimens of D. protuberans, C. quadrum and R. maculatus represent the first report of these parasitoids in Idaho. It was assumed that approximately 78 S. multistriatus emerged from the two bole sections and 4.3 parasitoids emerged for every emerging S. multistriatus. The calculated survival for S. multistriatus in these bole sections was approxiamtely 10.6% and the level of parastism of the S. multistriatus brood was approximately 46.1%.