Results 191 to 200 of about 2,694,797 (236)

A new hybrid between blue spruce and white spruce

Canadian Journal of Botany, 1969
Controlled pollinations were made within and between blue spruce (Picea pungens Engelm.) and white spruce (Picea glauca (Moench) Voss) in 1967 and 1968. Interspecific hybrids were obtained and verified by comparative measurements of several traits. The cross was successful when either species was used as the female parent.
James W. Hanover, Ronald C. Wilkinson
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Spruce Budworm Control in a White Spruce Plantation, 1977

Insecticide and Acaricide Tests, 1978
Abstract The test was designed to compare two experimental numbered compounds and a new formulation of Sevin to a standard formulation, Sevimol. Treatments were assigned randomly to three 30 x 30 ft plots marked out in the plantation. Treated plots were separated by 25 ft buffers.
J. B. Dimond, T. A. Morrison
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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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Bud and crown architecture of white spruce and black spruce

Trees, 2006
Needle primordia in buds and branch lengths were assessed in the crown of a plantation-grown white spruce tree. There was a gradation in needle primordia in buds in branches within the crown. The largest number of primordia was in the terminal bud of the leading main stem shoot, with the number in first-order whorl lateral shoot terminal buds ...
Stephen J. Colombo, Colin W. G. Templeton   +1 more
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B Chromosomes in White Spruce

Proceedings of the Royal Society of London. Series B. Biological Sciences, 1977
Abstract In Picea glauca, the White Spruce, supernumerary, B chromosomes were found in 48 out of 51 North American populations investigated. The B chromosomes are of two kinds. The more common (B1) is metacentric. The other (B2) has a subterminal centromere.
S. B. Teoh, Hubert Rees
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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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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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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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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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