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 in public schools. Despite resistance from both staff and members, he began initiatives within the UAW and the auto industry to recruit more minorities and women. He also pushed for national health insurance. Fraser retired as UAW president in 1983. He was an adjunct professor at Wayne State University for many years, teaching labor relations and labor history. A major research and study center, the Douglas A. Fraser Center for Workplace Issues, was named after him. Fraser received The International Center in New York's Award of Excellence for his significant contributions to life in America. Douglas Fraser died on February