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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 ...
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 ...
Pseudotsuga menziesii var. glauca, or Rocky Mountain Douglas-fir, is an evergreen conifer native to the interior mountainous regions of western North America, from central British Columbia and southwest Alberta in Canada southward through the United States to the far north of Mexico. [2] The range is continuous in the northern Rocky Mountains ...
Coast Douglas-fir is the second-tallest conifer in the world (after coast redwood), and the third-tallest of all trees, (after Eucalyptus regnans).Currently, coast Douglas-fir trees 60–75 metres (197–246 ft) or more in height and 1.5–2 metres (4.9–6.6 ft) in diameter are common in old growth stands, [4] and maximum heights of 100–120 metres (330–390 ft) and diameters up to 4.5–5. ...
On mature trees the leaves ('needles') are a glaucous blue-green, often darker green to dark yellow-green in winter, 2.5–5 centimetres (1–2 inches) long and 1–2 millimetres (1 ⁄ 32 – 3 ⁄ 32 in) broad, produced in fascicles of two with a persistent gray 5–10 mm (1 ⁄ 4 – 3 ⁄ 8 in) basal sheath. On vigorous young trees the ...
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.
Pseudotsuga macrocarpa typically grows from 15–30 m (49–98 ft) in height and 56–155 cm (1 ft 10 in – 5 ft 1 in) in trunk diameter. [6] The growth form is straight, with a conical crown from 12–30 m (39–98 ft) broad, and a strong and spreading root system. The bark is deeply ridged, composed of thin, woodlike plates separating heavy ...
Dendroctonus pseudotsugae. Dendroctonus pseudotsugae, the Douglas-fir beetle, is a species of bark beetle found in western North America. Three subspecies exist that correspond to the subspecies of Douglas-fir. The beetles also infest downed Larch trees. [ 1] Outbreaks often occur in conjunction with drought, root rot diseases, overcrowding ...