Results 151 to 160 of about 97,163 (199)

Norway spruce and spruce shoot aphid as indicators of traffic pollution

Environmental Pollution, 2000
Two-year-old Norway spruce (Picea abies (L.) Karst) seedlings were exposed to traffic emissions along roadsides with three different traffic densities and speed limits; highway, street and a quiet local road. The responses of the exposed seedlings as a host plant and those of spruce shoot aphid (Cinara pilicornis Hartig) were studied.
Viskari, E.-L., Kössi, S., Holopainen, Jarmo   +2 more
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Inheritance of plastids in interspecific hybrids of blue spruce and white spruce

Theoretical and Applied Genetics, 1989
Chloroplast DNA (cpDNA) was purified from blue spruce (Picea pungens Engelm.) and white spruce [P. glauca (Moench) Voss], and was digested with several different restriction endonucleases. Restriction fragment length polymorphisms (RFLPs) were identified that differentiated the cpDNA of both species.
M, Stine, B B, Sears, D E, Keathley
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The phenology of white spruce and the spruce budworm in northern Alberta

Canadian Journal of Forest Research, 1992
Studies on the development of spruce budworm (Choristoneurafumiferana (Clem.)) on white spruce (Piceaglauca (Moench) Voss) were conducted in northern Alberta in 1969 and again in 1990. The phenology of this insect and its host were described using stochastic models.
W.J.A. Volney, H.F. Cerezke
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Scopelophila ligulata (Spruce) Spruce.

2012
Nell'ambito della redazione di schede di assesment per la realizzazione di una lista rossa della flora vascolare e crittogamica italiana, viene presentata la scheda relativa a Scopelophila ligulata (Spruce) Spruce.
ALEFFI, Michele, TACCHI, Roberta
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Effectiveness of spruce budworm spraying in New Brunswick in protecting the spruce component of spruce–fir stands

Canadian Journal of Forest Research, 1984
Tree mortality and defoliation were examined in 45 spruce (Picea sp.) stands protected against damage by spruce budworm (Choristoneurafumiferana (Clem.)) and in 27 unprotected spruce stands in New Brunswick, and were related to tree, stand, and site characteristics.
David A. MacLean, A. Wayne Kline, Daniel R. Lavigne   +2 more
openaire   +1 more source

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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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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COMPARATIVE CHARACTERISTICS OF THE KISLICHNY SPRUCE AND THE DOLGOMOSHNY SPRUCE

Materials of the All-Russian scientific and practical conference dedicated to the 100th anniversary of the birth of Professor Vladimir Ageevich Bugaev "Forestry, forest management, forest management in the 21st century: problems and solutions"
Comparative data on the structure of the kislichny spruce and the Dolgomoshny spruce are present-ed. The objects of the study are located in the Prionezhsky forestry of the Republic of Karelia. The vegetation of the lower tiers was taken into account on circular accounting sites of 10 m2 each. It is shown that the average height and average diameter of
Anatoliy Gryaz'kin, Olga Gavrilova, E. Guryleva   +2 more
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Natural hybridization between black spruce and red spruce

Molecular Ecology, 1997
Using species‐specific random amplified polymorphic DNA (RAPD) markers and morphological characters, natural hybridization between the closely related black spruce Picea mariana (Mill.) B.S.P. and red spruce P. rubens Sarg. was evaluated in natural populations from north‐eastern North America.
M. Perron, J. Bousquet
openaire   +1 more source