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 Fraser Noble Sir Thomas Alexander Fraser Noble MBE (29 April 1918 – 21 August 2003) was a Scottish academic. He was former Vice-Chancellor of the University of Leicester and then Principal of the University of Aberdeen. He was born in Cromdale in Strathspey, Scotland. His father was Simon Noble of Grantown-on-Spey in the former Moray, and his mother was Jeanie Graham from Largs in North Ayrshire. His father died when he was eight. He had a brother. He attended Nairn Academy. He went to the University of Aberdeen when aged only 16. He graduated with a degree in Classics in