Canadian Forest Service Publications
Forest insect and disease conditions, Cariboo District, 1974. 1974. Doidge, D.F. Environment Canada, Forestry Service, Pacific Forest Research Centre, Victoria, BC. Information Report BC-X-116. 21 p.
Issued by: Pacific Forestry Centre
Catalog ID: 1448
Availability: PDF (download)
Spring in the Cariboo District was cold and wet, the summer warm and dry, and the fall had above normal temperatures. Douglas-fir and mountain pine beetles and spruce budworm were the most important insects. Red-topped Douglas-fir trees, killed by the Douglas-fir beetle, quadrupled along the Fraser River and near Williams Lake. Lodgepole pine trees were killed by the mountain pine beetle in the Cariboo Lake and Klinaklini River areas. Two-year-cycle spruce budworm defoliated 100,000 acres (40,000 ha) of alpine fir and spruce in the interior wetbelt portion of the District.
Winter drying affected 40,000 acres (16,000 ha) of lodgepole pine, cedar and spruce throughout the District. A needle cast moderately infected ponderosa pine near Clinton. Mistletoe and stem rusts were the most noticeable perennial diseases of lodgepole pine.
Aerial survey time was provided by the British Columbia Forest Service, including a helicopter reconnaissance of the mountain pine beetle infestation along the Klinaklini River.