Xylosandrus crassiusculus, an ambrosia beetle native to Asia and Africa, was introduced into the southeastern United States in 1974. Since that time, this species has substantially expanded its range, causing damage to native ecosystems and healthy nursery stock. This species was found in The Dalles, Oregon in 2004, indicating that it is not limited to sub-tropical environments. This introduction has resulted in a ban on the importation of green wood products from the southeastern United States into Oregon, especially hardwood railroad ties. This research investigated the ability of water and alcohol based dip treatments to penetrate existing galleries and to prevent the infestation of green hardwood products. The results indicated that even a 9 minute dip failed to penetrate the galleries. Dipping samples for 30 seconds in creosote prevented the establishment of new galleries. In addition, cinnamon leaf oil and diesel fuel reduced the degree of insect attack and merit further study. Preventing X. crassiusculus infestation has proven difficult and further studies are planned.

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