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Douglas-fir is one of the world's best timber-producing species and yields more timber than any other species in North America, making the forestlands of western Oregon, Washington, and British Columbia the most productive on the continent. In 2011, Douglas-fir represented 34.2% of US lumber exports, to a total of 1.053 billion board-feet.
Laminated root rot also known as yellow ring rot is caused by the fungal pathogen Phellinus weirii.Laminated root rot is one of the most damaging root disease amongst conifers in northwestern America and true firs, Douglas fir, Mountain hemlock, and Western hemlock are highly susceptible to infection with P. weirii.
By far the best-known is the very widespread and abundant North American species Pseudotsuga menziesii, a taxonomically complex species [14] divided into two major varieties (treated as distinct species or subspecies by some botanists): coast Douglas-fir or "green Douglas-fir", on the Pacific coast; and Rocky Mountain Douglas-fir or "interior ...
Pseudotsuga macrocarpa, commonly called the bigcone spruce or bigcone Douglas-fir, is an evergreen conifer native to the mountains of southern California. It is notable for having the largest (by far) cones in the genus Pseudotsuga , hence the name.
Articles related to the Douglas fir (Pseudotsuga menziesii) and its varieties. It is an evergreen conifer species in the pine family, Pinaceae . It is native to western North America .
It is a particularly important disease in lodgepole pine and subalpine fir as well. Studies have shown that 64% of all defects in these three species were caused by Porodaedalea pini. [5] It has been estimated that over three-fourths of the total 17% of decayed, overmature Douglas-fir in the Pacific Northwest were in decline due to red ring rot ...
Coniferiporia weirii root rot is recognized first by the symptoms it induces in its hosts. Reduced terminal growth is usually the first symptom to appear, followed by yellowing and thinning of crowns. Reduced growth rate is an attribute of tree infection. [4]
Another example is the girdling of selected Douglas-fir trees in some Northern California oak woodlands, such as Annadel State Park, in order to prevent that Douglas-fir from massive invasion of the mixed oak woodland. [5] Girdling can be used to create standing dead wood, or snags. This can provide a valuable habitat for a variety of wildlife ...