Christmas tree pests and weeds of different pests, most of which cause cosmetic damage to the trees, important in the Christmas tree industry. The balsam woolly adelgid ("Adelges picae") are small soft-bodied insects which attack the Fraser fir. The insects appear as white, woolly spots on the tree and are fatal to the fir if left untreated. The woolly adeligid was native to central Europe where it affected the silver fir; it was introduced to the United States, where it has no known native predators, before 1900. Balsam twig aphids ("Mindarus abietnus") are another type of tree pest which affects fir and spruce trees in
Douglas Fraser 23, 2008, of complications from emphysema at Providence Hospital in Southfield, Michigan. His life and professional career is documented in historical materials housed within the Walter P. Reuther Library at Wayne State University. His time as UAW president and vice-president and as university professor are chronicled in individual collections. The archival materials include personal correspondence, administrative memoranda, photographs, and other record types. Researchers are encouraged to find the collections at the Walter P. Reuther Library website. Douglas Fraser Douglas Andrew Fraser (December 18, 1916 – February 23, 2008) was a Scottish-American union leader. He was president of the United Auto