Beetles (Coleoptera) caught with pheromones of Gnathotrichus retusus and G-sulcatus (Col., Scolytidae) in southern Finland

The ambrosia beetle Gnathotrichus materiarius, which originally came from N orth America, was discovered in southern Finland in 1996. In 1997, using No rwegian drainpipe traps baited with pheromones of Gnathotrichus retusus and G. sulcatus, we collected beetles in the region where the first specimen h ad been caught in order to determine whether this potential pest species ha d become established in the area. Samples from a total of 16 traps included 79 species of beetles and 719 individuals, but no specimens of G. materiar ius. The most abundant species in the samples were the ambrosia beetles Xyl eborus dispar and Trypodendron lineatum. Several predators and other associ ates of bark beetles were also captured. The majority of the beetles caught were saproxylic species.