ABSTRACT Two studies were conducted to determine the effect of habitat selection and trap
placement on catches of Scolytidae and Cerambycidae (Coleoptera) in northeastern U.S. forests. In
a nonreplicated case study, four habitat typesÑclosed canopy hardwood stand, closed canopy conifer
stand, a low-intensity thinned Pinus strobus L. stand, and a high-intensity thinned P. strobus standÑ
were surveyed using-pinene, ethanol, ipsenol, ipsdienol, and lanierone. Average trap catches, species
richness, and the number of unique species captured were all highest in at least one of the thinned
habitats. A second experiment that was replicated evaluated the placement of traps in relation to
habitat patches. Semiochemical-baited traps (-pinene and ethanol) were placed under a closed
canopy forest, along an edge, and in a clearing and tested for effects on Scolytidae and Cerambycidae
trap catches. Abundance and species richness were generally higher in the closed canopy and edge
placements compared with traps in the open area. The highest number of unique species were
captured in the edge and clearing.