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 1938. He did military service with the Black Watch (Royal Highland Regiment). In 1962 he became Vice-Chancellor of the University of Leicester at the age of 43. The University of Leicester now has the Fraser Noble Building. In 1962 the university had 1,500 students and two faculties of Arts and Sciences. By the time he left, the university had five faculties and 6,000 students. Thanks to him, the Royal Commission on Medical Education (1965-68) in its 1968 report decided that the university needed a medical school. From 1970-72 he was Chairman of the Committee of Vice-Chancellors and Principals of the