Can the Exotic Brown Spruce Longhorn Beetle, Tetropium

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CAN THE EXOTIC BROWN SPRUCE LONGHORN BEETLE, TETROPIUM FUSCUM, SUCCESSFULLY COLONIZE HEALTHY TREES IN CANADA? Leah Flaherty1,2, Jon Sweeney2 and Deepa Pureswaran2 1University of New Brusnwick, Faculty of Forestry and Environmental Management, Fredericton, NB, E3B 6C2 2Natural Resources Canada, Canadian Forest Service, Fredericton, NB E3B5P7 ABSTRACT The exotic brown spruce longhorn beetle, Tetropium impact and risk associated with this invasion depends fuscum (Fabr.), (Coleoptera: Cerambycidae) was on whether this species acts as a primary or secondary discovered emerging from red spruce, Picea rubens Sarg., colonizer. This research evaluates the effect of host tree in Halifax, Nova Scotia in 1999. It is likely that T. fuscum condition on the colonization success and subsequent has been established in the Halifax area for more than performance of T. fuscum. Performance was assessed 19 years and was introduced in infested wood packing with and without exposure to natural enemies. Preliminary material in shipping containers received at the Halifax results indicate that T. fuscum can colonize apparently port. Tetropium fuscum primarily infests weakened or healthy trees in Canada, but that their survival is reduced recently cut Norway spruce, Picea abies (L.) Karst., in its on these trees. Natural enemies causing mortality in native Europe, but in Canada has been reported to attack exposed T. fuscum included two native endo-parasitoids, several species of apparently healthy spruce (Picea spp.). Rhimphoctona macrocephala (Provancher) and The mechanism that may allow T. fuscum to colonize Wroughtonia occidentalis (Cresson), and woodpeckers. healthy trees in Canada is unknown, however the potential 2009 USDA Research Forum on Invasive Species 69.

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