Christmas tree pests and weeds The pathogen often makes Douglas fir trees unsalable as Christmas trees and affects the Christmas tree farming industry. Douglas firs are also affected by "Phaeocryptopus gaumanni" which causes Swiss needlecast. Red band needle blight is a fungal disease which affects coniferous trees, particularly pine, with a worldwide distribution. The disease is caused by the fungi "Dothistroma septosporum". Since the late 1990s its appearance in the United Kingdom has increased, among the most affected species is Corsican pine and the disease has been a significant problem in Thetford Forest. Though the disease spread rapidly during September 2007 Christmas tree growers remained
Douglas Ranges Douglas Ranges The Douglas Ranges are a subrange of the Pacific Ranges of the Coast Mountains of the Canadian province of British Columbia, about east of downtown Vancouver, north of the Fraser River and between the valleys of Stave and Harrison Lakes. They are approximately in area. Their highest peak is Mount Robertson , at the northwest limit of the range. The Douglas Ranges among the smallest and lowest of the major named subranges Coast Mountains, but in addition to being smallest and lowest they are also the southernmost part of the Coast Mountains and therefore also of the Pacific