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Phaeocryptopus gaeumannii. Phaeocryptopus gaeumannii is a fungus that infects Douglas fir and causes Swiss needle cast, a yellowing of foliage and reduction in growth. It is endemic in western North American stands of Douglas fir, but was first discovered in Douglas fir trees planted Switzerland. When trees in America were checked, it was found ...
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 .
The red vole nests almost exclusively in the foliage of the trees, typically 2–50 metres (5–165 ft) above the ground, and its diet consists chiefly of Douglas-fir needles. [13] Douglas-fir needles are generally poor browse for ungulates, although in the winter when other food sources are lacking it can become important, and black-tailed ...
Phaeolus schweinitzii. Phaeolus schweinitzii, commonly known as velvet-top fungus, dyer's polypore, dyer's mazegill, or pine dye polypore, is a fungal plant pathogen that causes butt rot on conifers such as Douglas-fir, spruce, fir, hemlock, pine, and larch. [1] P. schweinitzii is a polypore, although unlike bracket fungi the fruiting body may ...
September 17, 2024 at 11:45 AM. LANSING, Mich. (FOX 2) - The emergence of an invasive pest in a mid-Michigan county that feeds on fir trees is worrying state officials enough that the agriculture ...
Red ring rot is common in North America. The pathogen Porodaedalea pini is widely spread in the temperate zone in the Northern Hemisphere. [4] It infects a wide range of coniferous trees, including jack pine, lodgepole pine, Sitka and white spruce, Douglas-fir, balsam and true fir, western hemlock, and tamarack.
On Douglas fir, eggs are laid on the needles and several generations of adelgids are produced. Yellow spots and bent needles result from feeding damage. 2 The needles of lightly to moderately infested trees exhibit chlorotic mottling where individual adults have fed. Attacked needles may also be twisted. Severely infested foliage may be ...
Black stain root disease. Leptographium wageneri var. pseudotsugae. Blue stain fungus. Grosmannia clavigera. Bleeding sap rot. Stereum sanguinolentum. Brown crumbly rot. Fomitopsis pinicola. Brown cubical rot.