Results 181 to 190 of about 11,437 (225)

Spruce Beetle Effects on a White Spruce Stand in Alaska

Journal of Forestry, 1974
Abstract A severe infestation of spruce beetle (Dendroctonus rufipennis Kby.) in a white spruce (Picea glauca [Moench] Voss)-paper birch (Betula papyrifera var.) stand caused 64.6 percent mortality of spruce 5 inches d.b.h. and larger where the infestation was completed. Survival of spruce was greater in smaller diameters.
Bruce H. Baker, Jerry A. Kemperman
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The Hybrid White Spruce X Himalayan Spruce

1982
Picea glauca and P. amithiana were successfully crossed. Crossability ranged from 2 to 30 percent depending on the female P. glauca parent tree. Early characteristics and growth in Wisconsin and in New Brunswick are described. P.
H. Nienstaedt, D. P. Fowler
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WHITE SPRUCE AND THE SPRUCE BUDWORM: DEFINING THE PHENOLOGICAL WINDOW OF SUSCEPTIBILITY

The Canadian Entomologist, 1997
AbstractSynchrony of insect and host tree phenologies has often been suggested as an important factor influencing the susceptibility of white spruce, Picea glauca (Moench) Voss, and other hosts to the spruce budworm, Choristoneura fumiferana (Clemens) (Lepidoptera: Tortricidae).
Robert K. Lawrence, William J. Mattson, Robert A. Haack   +2 more
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WHITE PINE WEEVIL ATTACK ON WHITE SPRUCE: A SURVIVAL TIME ANALYSIS

Ecological Applications, 2000
The survival time of a white spruce tree (Picea glauca (Moench) Voss) with respect to the attack by the white pine weevil (Pissodes strobi (Peck)) was defined as the number of years until an attack occurred. In this context, resistant trees are those capable of delaying attacks rather than preventing attacks.
He, F., Alfaro, R.I.
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Acquired thermotolerance of jack pine, white spruce and black spruce seedlings

Tree Physiology, 1991
The acquired thermotolerance of first-year seedlings of jack pine (Pinus banksiana Lamb.) hardened at 36, 38, 40 or 42 degrees C for 90, 180 or 360 minutes and of black spruce (Picea mariana (Mill.) B.S.P.) hardened at 34, 36, 38 or 40 degrees C for 30, 90, 180 or 360 minutes was determined by comparison of needle damage to that of non-hardened ...
R S, Koppenaal, S J, Colombo, E, Blumwald   +2 more
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The Sensitivity of Young White Spruce to Spruce Budworm Defoliation

Northern Journal of Applied Forestry, 1991
Abstract Relationships between defoliation and volume growth were determined for 68 young white spruce trees in a 20-year-old plantation defoliated over a 2-year period by the spruce budworm. In the first year of defoliation, intensities ranging from 7 to 89% of the current foliage did not influence volume growth significantly.
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NOTE ON THE PROPAGATION BY CUTTINGS OF WHITE PINE AND WHITE SPRUCE

Canadian Journal of Research, 1940
not available
T. L. Farrar, N. H. Grace
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Soil Adaptability of White Spruce

Journal of Forestry, 1938
Abstract In the study of silviculture, foresters attempt to classify various tree species according to tolerance, soil needs, and climatic requirements. White spruce has generally been classified as being adapted to acid soils. The data here presented bring np an interesting exception to the rule in which this species was found ...
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Growth of White Spruce in the Nursery

Forest Science, 1963
Abstract Glass-fronted boxes inserted in paths adjacent to nursery seedbeds were used to study root development of seedling white spruce, Picea glauca (Moench) Voss, during the third growing season. Total oven-dry weight increased about fourfold, tending to be linear through
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Frost Damage to White Spruce Buds

Canadian Journal of Forest Research, 1972
Unopened buds of white spruce (Piceaglauca (Moench) Voss) were damaged by late spring frost. At time of death of the apical meristem the buds were not ready for flushing. As expected on the basis of ground frosts, there was more damage among shorter trees than among taller trees, and more damage among open-grown trees than among understory trees.
J. R. Clements, J. W. Fraser, C. W. Yeatman   +2 more
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