24 articles
Blue spruce
Blue spruce (Picea pungens), also called Colorado blue spruce or silver spruce, is a slow-growing Rocky Mountain conifer native to Arizona, Colorado, Idaho, Montana, New Mexico, Utah, and Wyoming, grown widely as an ornamental and Colorado's state tree.
Choristoneura fumiferana
Choristoneura fumiferana, the spruce budworm, is a tortricid moth whose larvae defoliate balsam fir and spruce in North American boreal forests, causing recurring outbreaks at roughly 35-year intervals that can exceed 50 million hectares.
Dendroctonus micans
Dendroctonus micans, the great spruce bark beetle (European spruce bark beetle), is a Palaearctic bark beetle pest of spruce from Siberia to Britain, controlled mainly by the specific predator Rhizophagus grandis.
Dendroctonus rufipennis
Dendroctonus rufipennis, the spruce beetle, is a native North American bark beetle killing mature spruce across the continent. Distinguished from Ips typographus and D. ponderosae by its spruce hosts, two-year life cycle, and major Alaska and Yukon outbreaks.
European spruce bark beetle
European spruce bark beetle (Ips typographus, eight-toothed spruce bark beetle), a Scolytinae pest of Norway spruce; mass attacks with blue stain fungus kill spruce, and it is managed by salvage logging, debarking, and pheromone methods.
Kiidk'yaas
Kiidk'yaas, the Golden Spruce (Picea sitchensis 'Aurea'), was a sacred 300-year-old golden-needled Sitka spruce on the Yakoun River, Haida Gwaii, felled in January 1997 by Grant Hadwin as logging-industry protest; cuttings survive in Port Clements.
Old Tjikko
Old Tjikko is a Norway spruce (Picea abies) located on Fulufjället, Dalarna Province, Sweden. Its root system is dated to about 9,500 years, making it a notable living clone.
Picea
Picea (spruce) is a genus of about 35–50 evergreen conifers in Pinaceae, native to Northern Hemisphere boreal and montane forests, defined by peg-like needle bases and pendulous cones; key species include Picea abies and P. sitchensis.
Picea abies
Picea abies, Norway spruce (gran, Épinette de Norvège), a large Pinaceae conifer native to the Alps, Balkans, Carpathians, and Scandinavia; Europe's key forestry spruce, widely transplanted since the 1500s, Least Concern but drought- and bark-beetle-vulnerable.
Picea breweriana
Picea breweriana, Brewer spruce or weeping spruce, a rare spruce endemic to the Klamath Mountains of southwest Oregon and northwest California, with pendulous ropelike branchlets, cones 8–15 cm, and basal position in the genus Picea.
Picea engelmannii
Picea engelmannii, Engelmann spruce (Columbian spruce, mountain spruce), a long-lived high-elevation conifer of the Rocky Mountains and Cascades from British Columbia to Arizona and New Mexico, typically codominant with subalpine fir, threatened by spruce beetle outbreaks and projected range reduction under warming.
Picea glauca
Picea glauca, white spruce (also Canadian spruce, Black Hills spruce), a dominant boreal conifer of Alaska and Canada. Transcontinental range, 25 m average height, pulp and lumber wood; improved seedlots grow 17% faster.
Picea mariana
Picea mariana, black spruce (bog spruce, swamp spruce), a dominant North American boreal conifer from Alaska to Newfoundland, with semiserotinous cones adapted to fire, Canada's most important pulpwood species, IUCN Least Concern.
Picea rubens
Picea rubens, red spruce (épinette rouge), a medium-sized Pinaceae conifer of eastern North America from the Canadian Maritimes to the southern Appalachians; long-lived, shade-tolerant, IUCN Least Concern, timber and musical-instrument wood.
Picea sitchensis
Picea sitchensis, Sitka spruce (coast, tideland, or yellow spruce), the world's largest spruce, a conifer native to the Pacific coast from Alaska to northern California, widely planted in Britain and Ireland for timber, with acidic-soil, hypermaritime habitat requirements.
Sino-Himalayan spruces of section Serrae
The Sino-Himalayan spruces of section Serrae are five East Asian Picea species, including dragon spruce and Taiwan spruce, distinguished by four-sided needles and centered on the Qinghai-Tibetan Plateau.
Sitka spruce
Sitka spruce (Picea sitchensis), also called tideland spruce, is the largest spruce, growing on the Pacific coast from Alaska to California and exceeding 100 m.
Spruce
Spruce, genus Picea, 40-50 evergreen conifer species of the Northern Hemisphere with peg-attached needles and pendant cones; includes Norway and Sitka spruce, major softwood timber trees threatened by bark beetles and drought.
Spruce cultivation and ornamental horticulture
Spruce cultivation and ornamental horticulture: growing Picea species such as Colorado blue, Norway, and white spruce as landscape, dwarf, and Christmas trees; site selection, watering, dwarf cultivar classes, and pest management.
Spruce forest ecology
Spruce forest ecology is the study of forests dominated by spruce trees (genus Picea), covering how these evergreen conifers regenerate, interact with soil fungi, and respond to climate change.
Spruce hybrids and introgression
Spruce hybrids are natural crosses between Picea species where ranges meet, producing introgression, the movement of genes between species; despite hybridization lasting at least 21,000 years, spruce species remain genetically distinct.
Spruce pests and diseases
Spruce pests and diseases are the insects, fungi, and fungus-like organisms that injure or kill spruce trees, led by the spruce beetle in North America.
Spruce Production Division
Spruce Production Division, a U.S. Army command of World War I (1917-1918) under Brig. Gen. Brice P. Disque, using about 30,000 soldiers in Pacific Northwest logging camps to produce aircraft-grade Sitka spruce, reaching 143 million board feet.
Spruce silviculture and timber
Spruce silviculture and timber covers the plantation management, harvesting, and wood utilization of spruce, chiefly Norway and Sitka spruce, used for construction timber, pulp, and tonewood.