Comparison of baited bottle and multiple-funnel traps for ambrosia beetles (Coleoptera: Curculionidae: Scolytinae) in Eastern United States 1
We compared bottle traps to 4-unit multiple-funnel traps (both baited with ethanol and conophthorin) for relative efficacy in catching ambrosia beetles (Coleoptera: Curculio- nidae: Scolytinae) at four locations in the eastern United States. Our results were geographically inconsistent for three target species. Catches of Xylosandrus germanus (Blandford) in Ohio were greater in bottle traps than in funnel traps while the opposite occurred in Virginia, with no difference in Indiana. Catches of Xyleborinus saxesenii (Ratzeburg) were greater in funnel traps than in bottle traps in Georgia, Indiana, and Virginia but no different in Ohio. Similarly, catches of Xylosandrus crassiusculus (Motschulsky) were greater in funnel traps than in bottle traps in Georgia and Virginia but not in Indiana. Bottle traps caught more Anisandrus maiche Stark in Ohio and Anisandrus sayi (Hopkins) in Indiana whereas more of the following species were caught in funnel traps: Ambrosiophilus atratus (Eichhoff ) in Virginia, Cyclorhipidion bodoanum (Reitter) and Dryoxylon onoharaense (Murayama) in Georgia, Euwallacea validus (Eichhoff ) in Ohio, and Cyclorhipidion pelliculosum (Eichhoff) and Monarthrum fasciatum (Say) in Indiana. Catches of Cnestus mutilatus (Blandford) in Georgia and Monarthrum mali (Fitch) in Indiana were unaffected by trap type. Differences in trap height, bottle size, and forest composition may have contributed to between-site variability in trap type preferences, thereby requiring further research to resolve these issues.