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Picea engelmannii, with the common names Engelmann spruce, [3] white spruce, [3] mountain spruce, [3] and silver spruce, [3] is a species of spruce native to western North America. It is mostly a high-elevation mountain tree but also appears in watered canyons.
Choristoneura fumiferana, the eastern spruce budworm, is a species of moth of the family Tortricidae native to the eastern United States and Canada. The caterpillars feed on the needles of spruce and fir trees. Eastern spruce budworm populations can experience significant oscillations, with large outbreaks sometimes resulting in wide scale tree ...
Choristoneura freemani Razowski, 2008, western spruce budworm; Choristoneura fumiferana (Clemens, 1865), eastern spruce budworm; Choristoneura griseicoma (Meyrick, 1924) Choristoneura hebenstreitella (Muller, 1764), mountain-ash tortricid; Choristoneura heliaspis (Meyrick, 1909) Choristoneura improvisana (Kuznetsov, 1973)
Picea glauca, the white spruce, [4] is a species of spruce native to the northern temperate and boreal forests in North America. Picea glauca is native from central Alaska all through the east, across western and southern/central Canada to the Avalon Peninsula in Newfoundland, and south to Montana, North Dakota, Minnesota, Wisconsin, Michigan, Upstate New York and Vermont, along with the ...
Intensive sampling in the Smithers/Hazelton/Houston area of British Columbia showed Douglas (1975), [5] according to Coates et al. (1994), [6] that cone scale morphology was the feature most useful in differentiating species of spruce; the length, width, length: width ratio, the length of free scale (the distance from the imprint of the seed ...
Choristoneura occidentalis [or Choristoneura freemani in some schemes], the western spruce budworm, is a species of moth of the family Tortricidae. It is the most destructive defoliator of coniferous forests in western North America.
The members of the pine family (pines, spruces, firs, cedars, larches, etc.) have cones that are imbricate (that is, with scales overlapping each other like fish scales).). These cones, especially the woody female cones, are considered the "archetypal" tree cones.The female cone has two types of scale: the bract scales, and the seed scales (or ovuliferous scales), one subtended by each bract ...
The spruce bud moth defoliates young white spruce trees, and after 1980, upon the plantation of extensive regions of white spruce, has been considered a pest. As mentioned, the larvae of the spruce bud moth, in particular, deform the buds of the spruce tree greatly, specifically destroying the cortical tissue and crown of the tree, weakening ...