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Timber

P. abies wood

Spruce is useful as a building wood, commonly referred to by several different names including North American timber, SPF (spruce, pine, fir) and whitewood (the collective name for spruce wood). Spruce wood is used for many purposes, ranging from general construction work and crates to highly specialised uses in wooden aircraft. The Wright brothers' first aircraft, the Flyer, was built of spruce.[24]

Because this species has no insect or decay resistance qualities after logging, it is generally recommended for construction purposes as indoor use only (indoor drywall framing, for example). Spruce wood, when left outside cannot be expected to last more than 12–18 months depending on the type of climate it is exposed to.[25]

Pulpwood

Spruce is one of the most important woods for paper uses, as it has long wood fibres which bind together to make strong paper. The fibres are thin walled and collapse to thin bands upon drying. Spruces are commonly used in mechanical pulping as they are easily bleached. Together with northern pines, northern spruces are commonly used to make NBSK. Spruces are cultivated over vast areas as pulpwood.

Food and medicine

Spruce (Picea mariana) essential oil in a clear glass vial

The fresh shoots of many spruces are a natural source of vitamin C.[26] Captain Cook made alcoholic sugar-based spruce beer during his sea voyages in order to prevent scurvy in his crew.[27][28] The leaves and branches, or the essential oils, can be used to brew spruce beer.

The tips from the needles can be used to make spruce tip syrup[clarification needed]. In survival situations spruce needles can be directly ingested or boiled into a tea.[29] This replaces large amounts of vitamin C. Also, water is stored in a spruce's needles, providing an alternative means of hydration[clarification needed]. Spruce can be used as a preventive measure for scurvy in an environment where meat is the only prominent food source[clarification needed].

Tonewood

Spruce is the standard material used in soundboards for many musical instruments, including guitars, mandolins, cellos, violins, and the soundboard at the heart of a piano and the harp. Wood used for this purpose is referred to as tonewood.

Spruce, along with cedar, is often used for the soundboard/top of an acoustic guitar. The main types of spruce used for this purpose are Sitka, Engelmann, Adirondack and European spruces.

Other uses

The resin was used in the manufacture of pitch in the past (before the use of petrochemicals); the scientific name Picea derives from Latin picea "pitch pine" (referring to Scots pine),[30] from piceus, an adjective from pix "pitch".

Native Americans in North America use the thin, pliable roots of some species for weaving baskets and for sewing together pieces of birch bark for canoes. See also Kiidk'yaas for an unusual golden Sitka Spruce sacred to the Haida people.

Spruces are popular ornamental trees in horticulture, admired for their evergreen, symmetrical narrow-conic growth habit. For the same reason, some (particularly Picea abies and P. omorika) are also extensively used as Christmas trees, with artificial Christmas trees often being produced in their likenesses.

Spruce branches are also used at Aintree racecourse, Liverpool, to build several of the fences on the Grand National course. It is also used to make sculptures.

Diseases

Manually decorticated trunk of a spruce as protection to bark beetles
The picture shows the structure of spruce tree cells. Spruce belongs to the genus of coniferous evergreen trees of the pine family. There are about 40 species. It is one of the main forest-forming species. From it are obtained tar, turpentine, rosin.

Sirococcus blight (Deuteromycotina, Coelomtcetes)

The closely related species Sirococcus conigenus and S. piceicola cause shoot blight and seedling mortality of conifers in North America, Europe, and North Africa.[31] Twig blight damage to seedlings of white and red spruces in a nursery near Asheville, North Carolina, was reported by Graves (1914).[32] Hosts include white, black, Engelmann, Norway, and red spruces, although they are not the plants most commonly damaged. Sirococcus blight of spruces in nurseries show up randomly in seedlings to which the fungus was transmitted in infested seed. First-year seedlings are often killed, and larger plants may become too deformed for planting. Outbreaks involving < 30% of spruce seedlings in seedbeds have been traced to seed lots in which only 0.1% to 3% of seeds were infested. Seed infestation has in turn been traced to the colonization of spruce cones by S. conigenus in forests of the western interior. Infection develops readily if conidia are deposited on succulent plant parts that remain wet for at least 24 hours at 10 °C to 25 °C. Longer periods of wetness favour increasingly severe disease. Twig tips killed during growth the previous year shows a characteristic crook.

Rhizosphaera kalkhoffi needle cast

Rhizosphaera infects white spruce, blue spruce (Picea pungens), and Norway spruces throughout Ontario, causing severe defoliation and sometimes killing small, stressed trees. White spruce is intermediately susceptible. Dead needles show rows of black fruiting bodies. Infection usually begins on lower branches. On white spruce, infected needles are usually retained on the tree into the following summer. The fungicide Chlorthalonil is registered for controlling this needle cast (Davis 1997).[33]

Valsa kunzei branch and stem canker

A branch and stem canker associated with the fungus Valsa kunzei Fr. var. picea was reported on white and Norway spruces in Ontario (Jorgensen and Cafley 1961)[34] and Quebec (Ouellette and Bard 1962).[35] In Ontario, only trees of low vigour were affected, but in Quebec vigorous trees were also infected.

Predators

Spruce in the park of Peterhof

Small mammals consume conifer seeds, and also eat seedlings. Cage feeding of deer mice (Peromyscus maniculatus) and red-backed vole (Myodes gapperi) showed a daily maximum seed consumption of 2000 white spruce seeds and of 1000 seeds of lodgepole pine, with the 2 species of mice consuming equal amounts of seed, but showing a preference for the pine over the spruce (Wagg 1963).[36] The short-tailed meadow vole (Microtus pennsylvanicus Ord) voraciously ate all available white spruce and lodgepole pine seedlings, pulling them out of the ground and holding them between their front feet until the whole seedling had been consumed. Wagg (1963)[36] attributed damage observed to the bark and cambium at ground level of small white spruce seedlings over several seasons to meadow voles.

Once shed, seeds contribute to the diet of small mammals, e.g., deer mice, red-backed voles, mountain voles (Microtus montanus), and chipmunks (Eutamias minimus). The magnitude of the loss is difficult to determine, and studies with and without seed protection have yielded conflicting results. In western Montana, for example, spruce seedling success was little better on protected than on unprotected seed spots (Schopmeyer and Helmers 1947),[37] but in British Columbia spruce regeneration depended on protection from rodents (Smith 1955).[38]

An important albeit indirect biotic constraint on spruce establishment is the depredation of seed by squirrels. As much as 90% of a cone crop has been harvested by red squirrels (Zasada et al. 1978).[39] Deer mice, voles, chipmunks, and shrews can consume large quantities of seed; 1 mouse can eat 2000 seeds per night.[40] Repeated applications of half a million seeds/ha failed to produce the 750 trees/ha sought by Northwest Pulp and Power, Ltd., near Hinton, Alberta (Radvanyi 1972),[41] but no doubt left a lot of well-fed small mammals. Foraging by squirrels for winter buds (Rowe 1952)[42] has not been reported in relation to young plantations, but Wagg (1963)[36] noted that at Hinton AB, red squirrels were observed cutting the lateral and terminal twigs and feeding on the vegetative and flower buds of white spruce.

Red squirrels in Alaska have harvested as much as 90% of a cone crop (Zasada et al. 1978);[39] their modus operandi is to cut off great numbers of cones with great expedition early in the fall, and then "spend the rest of the fall shelling out the seeds". In Manitoba, Rowe (1952)[42] ascribed widespread severing of branch tips 5 cm to 10 cm long on white spruce ranging "from sapling to veteran size" to squirrels foraging for winter buds, cone failure having excluded the more usual food source. The damage has not been reported in relation to small trees, outplants or otherwise.

Porcupines (Erethizon dorsatum L.) may damage spruce (Nienstaedt 1957),[43] but prefer red pine (McLeod 1956).[44] Bark-stripping of white spruce by black bear (Euarctos americanus perniger) is locally important in Alaska (Lutz 1951),[45] but the bark of white spruce is not attacked by field mice (Microtus pennsylvanicus Ord),[46] even in years of heavy infestation.

Pests

The eastern spruce budworm (Choristoneura fumiferana) is a major pest of spruce trees in forests throughout Canada and the eastern United States.[47] Two of the main host plants are black spruce and white spruce.[48] Population levels oscillate, sometimes reaching extreme outbreak levels that can cause extreme defoliation of and damage to spruce trees. To reduce destruction, there are multiple methods of control in place, including pesticides.[49]

Horntails, or Wood Wasps, use this tree for egg laying and the larvae will live in the outer inch of the tree under the bark.

Spruce Beetles (Dendroctonus rufipennis) have destroyed swathes of spruce forest in western North America from Alaska to Wyoming.

Genome

The nuclear,[50] mitochondrial[51][52] and chloroplast[53] genomes of British Columbia interior spruce have been sequenced. The large (20 Gbp) nuclear genome and associated gene annotations of interior spruce (genotype PG29) were published in 2013.[54] and 2015.[55]

References

  1. ^ Sunset Western Garden Book, 1995:606–607
  2. ^ Hart, G.T. (2018) Plants in Literature and Life: a wide-ranging dictionary of botanical terms. FriesenPress. ISBN 978-1770674417
  3. ^ "Pine Relatives". Lovett Pinetum. Retrieved 27 August 2018.
  4. ^ "Swedish Spruce Is World's Oldest Tree: Scientific American Podcast". 27 May 2008. Retrieved 21 August 2016.
  5. ^ "spruce - Origin and meaning of spruce by Online Etymology Dictionary". www.etymonline.com. Retrieved 14 July 2020.
  6. ^ a b morphological differentiation among spruce species and their hybrids is more difficult. Species classification for seeds collected from spruce stands in which introgressive hybridization between white and Sitka spruces (P. sitchensis) may have occurred is important for determining appropriate cultural regimens in the nursery. If, for instance, white spruce grown at container nurseries in southwestern British Columbia are not given an extended photoperiod, leader growth ceases early in the first growing season, and seedlings do not reach the minimum height specifications.[17][18] But, if an extended photoperiod is provided for Sitka spruce, seedlings become unacceptably tall by the end of the first growing season .[19] Species classification of seedlots collected in areas where hybridization of white and Sitka spruces has been reported has depended on (i) easily measured cone scale characters of seed trees, especially free scale length, (ii) visual judgements of morphological characters, e.g., growth rhythm, shoot and root weight, and needle serration, or (iii) some combination of (i) and (ii) (Yeh and Arnott 1986).[19] Useful to a degree, these classification procedures have important limitations; genetic composition of the seeds produced by a stand is determined by both the seed trees and the pollen parents, and species classification of hybrid seedlots and estimates of their level of introgression on the basis of seed-tree characteristics can be unreliable when hybrid seedlots vary in their introgressiveness in consequence of spatial and temporal variations in contributions from the pollen parent (Yeh and Arnott 1986).[19] Secondly, morphological characters are markedly influenced by ontogenetic and environmental influences, so that to discern spruce hybrid seedlot composition with accuracy, hybrid seedlots must differ substantially in morphology from both parent species. Yeh and Arnott (1986)[19] pointed out the difficulties of estimating accurately the degree of introgression between white and Sitka spruces; introgression may have occurred at low levels, and/or hybrid seed lots may vary in their degree of introgression in consequence of repeated backcrossing with parental species.

    Spruce seedlings are most susceptible immediately following germination, and remain highly susceptible through to the following spring. More than half of spruce seedling mortality probably occurs during the first growing season and is also very high during the first winter,[20] when seedlings are subjected to freezing damage, frost heaving and erosion, as well as smothering by litter and snow-pressed vegetation. Seedlings that germinate late in the growing season are particularly vulnerable because they are tiny and have not had time to harden off fully.

    Mortality rates generally decrease sharply thereafter, but losses often remain high for some years. "Establishment" is a subjective concept based on the idea that once a seedling has successfully reached a certain size, not much is likely to prevent its further development. Criteria vary

    Mortality rates generally decrease sharply thereafter, but losses often remain high for some years. "Establishment" is a subjective concept based on the idea that once a seedling has successfully reached a certain size, not much is likely to prevent its further development. Criteria vary, of course, but Noble and Ronco (1978),[21] for instance, considered that seedlings 4 to 5 years old, or 8 cm to 10 cm tall, warranted the designation "established", since only unusual factors such as snow mold, fire, trampling, or predation would then impair regeneration success. Eis (1967)[22] suggested that in dry habitats on either mineral soil or litter seedbeds a 3-year-old seedling may be considered established; in moist habitats, seedlings may need 4 or 5 years to become established on mineral soil, possibly longer on litter seedbeds.

    Growth remains very slow for several to many years. Three years after shelterwood felling in subalpine Alberta, dominant regeneration averaged 5.5 cm in height in scarified blocks, and 7.3 cm in non-scarified blocks (Day 1970),[23] possibly reflecting diminished fertility with the removal of the A horizon.

    Spruce is useful as a building wood, commonly referred to by several different names including North American timber, SPF (spruce, pine, fir) and whitewood (the collective name for spruce wood). Spruce wood is used for many purposes, ranging from general construction work and crates to highly specialised uses in wooden aircraft. The Wright brothers' first aircraft, the Flyer, was built of spruce.[24]

    Because this species has no insect or decay resistance qualities after logging, it is generally recommended for construction purposes as indoor use only (indoor drywall framing, for example). Spruce wood, when left outside cannot be expected to last more than 12–18 months depending on the type of climate it is exposed to.[25]

    Pulpwood

    Spruce is one of the most important woods for paper uses, as it has long wood fibres which bind together to make strong paper. The fibres are thin walled and collapse to thin bands upon drying. Spruces are commonly used in mechanical pulping as they are easily bleached. Together with northern pines, northern spruces are commonly used to make NBSK. Spruces are cultivated over vast areas as pulpwood.

    Food and medicine

    Spruce (Picea mariana) essential oil in a clear glass vial

    The fresh shoots of many spruces are a natural source of vitamin C.[26] Captain Cook made alcoholic sugar-based [25]

    Spruce is one of the most important woods for paper uses, as it has long wood fibres which bind together to make strong paper. The fibres are thin walled and collapse to thin bands upon drying. Spruces are commonly used in mechanical pulping as they are easily bleached. Together with northern pines, northern spruces are commonly used to make NBSK. Spruces are cultivated over vast areas as pulpwood.

    Food and medicine

    Rhizosphaera infects white spruce, blue spruce (Picea pungens), and Norway spruces throughout Ontario, causing severe defoliation and sometimes killing small, stressed trees. White spruce is intermediately susceptible. Dead needles show rows of black fruiting bodies. Infection usually begins on lower branches. On white spruce, infected needles are usually retained on the tree into the following summer. The fungicide Chlorthalonil is registered for controlling this needle cast (Davis 1997).[33]

    Valsa kunzei branch and stem canker

    A branch and stem canker associated with the fungus Valsa kunzei Fr. var. picea was reported on white and Norway spruces in Ontario (Jorgensen and Cafley 1961)[34] and Quebec (Ouellette and Bard 1962).[35] In Ontario, only trees of low vigour were affected, but in Quebec vigorous trees were also infected.

    Predators

    Spruce in the park of Peterhof

    Small mammals consume conifer

    Rhizosphaera infects white spruce, blue spruce (Picea pungens), and Norway spruces throughout Ontario, causing severe defoliation and sometimes killing small, stressed trees. White spruce is intermediately susceptible. Dead needles show rows of black fruiting bodies. Infection usually begins on lower branches. On white spruce, infected needles are usually retained on the tree into the following summer. The fungicide Chlorthalonil is registered for controlling this needle cast (Davis 1997).[33]

    Valsa kunzei branch and stem cankerA branch and stem canker associated with the fungus Valsa kunzei Fr. var. picea was reported on white and Norway spruces in Ontario (Jorgensen and Cafley 1961)[34] and Quebec (Ouellette and Bard 1962).[35] In Ontario, only trees of low vigour were affected, but in Quebec vigorous trees were also infected.

    Predators

    conifer seeds, and also eat seedlings. Cage feeding of deer mice (Peromyscus maniculatus) and red-backed vole (Myodes gapperi) showed a daily maximum seed consumption of 2000 white spruce seeds and of 1000 seeds of lodgepole pine, with the 2 species of mice consuming equal amounts of seed, but showing a preference for the pine over the spruce (Wagg 1963).[36] The short-tailed meadow vole (Microtus pennsylvanicus Ord) voraciously ate all available white spruce and lodgepole pine seedlings, pulling them out of the ground and holding them between their front feet until the whole seedling had been consumed. Wagg (1963)[36] attributed damage observed to the bark and cambium at ground level of small white spruce seedlings over several seasons to meadow voles.

    Once shed, seeds contribute to the diet of small mammals, e.g., deer mice, red-backed voles, mountain voles (Microtus montanus), and chipmunks (Eutamias minimus). The magnitude of the loss is difficult to determine, and studies with and without seed protection have yielded conflicting results. In western Montana, for example, spruce seedling success was little better on protected than on unprotected seed spots (Schopmeyer and Helmers 1947),[37] but in British Columbia spruce regeneration depended on protection from rodents (Smith 1955).[38]

    An important albeit indirect biotic constraint on spruce establishment is the depredation of seed by squirrels.

    Once shed, seeds contribute to the diet of small mammals, e.g., deer mice, red-backed voles, mountain voles (Microtus montanus), and chipmunks (Eutamias minimus). The magnitude of the loss is difficult to determine, and studies with and without seed protection have yielded conflicting results. In western Montana, for example, spruce seedling success was little better on protected than on unprotected seed spots (Schopmeyer and Helmers 1947),[37] but in British Columbia spruce regeneration depended on protection from rodents (Smith 1955).[38]

    An important albeit indirect biotic constraint on spruce establishment is the depredation of seed by squirrels. As much as 90% of a cone crop has been harvested by red squirrels (Zasada et al. 1978).[39] Deer mice, voles, chipmunks, and shrews can consume large quantities of seed; 1 mouse can eat 2000 seeds per night.[40] Repeated applications of half a million seeds/ha failed to produce the 750 trees/ha sought by Northwest Pulp and Power, Ltd., near Hinton, Alberta (Radvanyi 1972),[41] but no doubt left a lot of well-fed small mammals. Foraging by squirrels for winter buds (Rowe 1952)[42] has not been reported in relation to young plantations, but Wagg (1963)[36] noted that at Hinton AB, red squirrels were observed cutting the lateral and terminal twigs and feeding on the vegetative and flower buds of white spruce.

    Red squirrels in Alaska have harvested as much as 90% of a cone crop (Zasada et al. 1978);[39] their modus operandi is to cut off great numbers of cones with great expedition early in the fall, and then "spend the rest of the fall shelling out the seeds". In Manitoba, Rowe (1952)[42] ascribed widespread severing of branch tips 5 cm to 10 cm long on white spruce ranging "from sapling to veteran size" to squirrels foraging for winter buds, cone failure having excluded the more usual food source. The damage has not been reported in relation to small trees, outplants or otherwise.

    Porcupines (Erethizon dorsatum L.) may damage spruce (Nienstaedt 1957),[43] but prefer red pine (McLeod 1956).[44] Bark-stripping of white spruce by black bear (Euarctos americanus perniger) is locally important in Alaska (Lutz 1951),[45] but the bark of white spruce is not attacked by field mice (Microtus pennsylvanicus Ord),[46] even in years of heavy infestation.

    The eastern spruce budworm (Choristoneura fumiferana) is a major pest of spruce trees in forests throughout Canada and the eastern United States.[47] Two of the main host plants are black spruce and white spruce.[48] Population levels oscillate, sometimes reaching extreme outbreak levels that can cause extreme defoliation of and damage to spruce trees. To reduce destruction, there are multiple methods of control in place, including pesticides.[49]

    Horntails, or Wood Wasps, use this tree for egg laying and the larvae will live in the outer inch of the tree under the bark.

    Spruce Beetles (Dendroctonus rufipennis) have destroyed swathes of spruce forest in western North America from Alaska to Wyoming.

    [50] mitochondrial[51][52] and chloroplast[53] genomes of British Columbia interior spruce have been sequenced. The large (20 Gbp) nuclear genome and associated gene annotations of interior spruce (genotype PG29) were published in 2013.[54] and 2015.[55]

    References<