Canadian Forest Service Publications

Forest insect- and disease-caused depletions to forests of west-central Canada: 1982-87. 1994. Brandt, J.P.; Amirault, P. Natural Resources Canada, Canadian Forest Service, Northwest Region, Northern Forestry Centre, Edmonton, Alberta. Information Report NOR-X-333.

Year: 1994

Issued by: Northern Forestry Centre

Catalog ID: 11632

Language: English

Series: Information Report (NoFC - Edmonton)

Availability: Order paper copy (free), PDF (download)

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Major forest insect- and disease-caused depletions to the forest resources of Alberta, Saskatchewan, Manitoba, and the Northwest Territories were determined as 3 765 000 m3/year between 1982 and 1987. A set of depletion rules were constructed for the major forest pests of the prairie provinces and were used to create depletion estimates. Significant depletions were caused by spruce budworm (Choristoneura fumiferana [Clem.]), jack pine budworm (C. pinus pinus Free.), forest tent caterpillar (Malacosoma disstria Hbn.), mountain pine beetle (Dendroctonus ponderosae Hopk.), spruce beetle (D. rufipennis [Kby.]), and wood decay. Depletion estimates were not determined for dwarf mistletoe, pests of young stands, and fungi such as needle casts of conifers, stem rusts of conifers, and cankers of conifers and hardwoods. The impact of Dutch elm disease on commercial forests was negligible. Spruce budworm defoliation resulted in 1900 m3/year of volume loss due to growth reduction and 9900 m3/year due to mortality. Jack pine budworm caused volume losses of 80 600 m3/year in growth reduction and 425 700 m3/year in mortality. Forest tent caterpillar defoliation caused 1 801 400 m3/year in growth reduction; with the depletion estimates used, there was no mortality associated with forest tent caterpillar. Volume depletions for mountain pine beetle and spruce beetle were 64 400 m3/year and 7900 m3/year, respectively. Wood decay volume loss was 1 373 200 m3/year.