The Douglas-fir needle midge can be a very destructive pest of
Douglas-fir. Infestation of new needles can be as high as 100 per-cent. Severe infestations can cause intolerable needle loss, and trees may take several years to recover. Needle loss is an especially serious problem in Christmas trees because of...
Published June 1991. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
CBT was first detected in North America during
1990 in southern British Columbia, Canada. The first
recorded U.S. contact was in far northwestern
Washington in February 1991. CBT distribution in
the Old World suggests that cold will not limit the
moth's range in Oregon. Warmer, drier areas may
inhibit its...
Carpenter ants are serious pests of buildings in Oregon, particularly west of the Cascade Mountains. Although they normally excavate in logs, stumps, and hollow trees, these ants become pests when they move indoors.