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
Fraser Noble Universities of the United Kingdom (now known as Universities UK). From 1948 to 1957 he lectured in Political Economy (Economics) at the University of Aberdeen. He drew up the constitution for the Scottish Economic Society. He became the Principal of the University of Aberdeen in 1976. The university, like Leicester, has a Fraser Noble Building. He was knighted in the 1971 Birthday Honours. He married in 1945 and they had a son and a daughter. His wife taught Maths at Nairn Academy. He enjoyed playing golf. He lived in Nairn for the last 22 years of his life. Fraser Noble