Canadian Forest Service Publications
Forest insect and disease conditions, Kamloops District, 1974. 1974. Cottrell, C.B.; Koot, H.P. Environment Canada, Forestry Service, Pacific Forest Research Centre, Victoria, BC. Information Report BC-X-113. 14 p.
Issued by: Pacific Forestry Centre
Catalog ID: 1439
Availability: PDF (download)
Bark beetles continued to be the most destructive insect pests in the Kamloops Forest District. The number of lodgepole pine killed by mountain pine beetle increased in the Okanagan Valley, and caused moderate to heavy losses of western white pine in the Shuswap and North Thompson valleys. Attacks on ponderosa pine remained of little significance throughout the District.
Defoliating insects caused more damage in 1974 than in 1973. Western false hemlock looper infestations became the largest ever known. Douglas-fir stands in the North and South Thompson, Shuswap and Okanagan Valleys were heavily defoliated. Western spruce budworm outbreaks expanded for the seventh consecutive year in the Bridge River area. Douglas-fir tussock moth infestations greatly increased in size in the North Thompson Valley and Kamloops Lake area, but declined in the Okanagan Valley. Western hemlock loopers caused light foliage damage in the North Thompson Valley, but declined in other wetbelt areas of the District.
Most of the current spectacular disease problems were caused by climatic factors, such as winter drying of lodgepole pine in the northern part of the District, and Douglas-fir and ponderosa pine in the western portion.