Placement of traps relative to a habitat patch also
may inßuence trap catches of forest insects. Several
studies have found differences in traps placed under
closed canopy conditions compared with more open
habitats (Francese et al. 2008, Sverdrup-Thygeson and
Birkemoe 2009). Currently, survey traps for exotic
species in the northeastern United States are typically
placed in clearings adjacent to forest patches or in
open environs at ports of entry, along forested stand
edges, and within a closed canopy forest. It is likely
that conditions present at each of these trap placement
positions are different, thereby affecting pheromone
behavior at each trap (Thistle et al. 2004,
Strand et al. 2009) and subsequent response of forest
Coleoptera. However, no information exists on how
trap placement inßuences trapping results using com-
1 Corresponding author, e-mail: kdodds@fs.fed.us. mon semiochemicals for exotic species surveys.