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50 year old sitka spruce picea sitchensis plantations with a history of intense weevil pissodes strobi attack



50 year old sitka spruce picea sitchensis plantations with a history of intense weevil pissodes strobi attack



Journal of the Entomological Society of British Columbia 79: 62-65



The condition of 26 plantations of Sitka spruce (Picea sitchensis (Bong)Carr.) established between 1930-1935, at Green Timbers, Surrey, British Columbia [Canada], which sustained repeated attack by the white pine weevil (P. strobi Peck) was examined in 1981. The plantations were started either as pure Sitka spruce or as a mixture of spruce and Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). A detailed survey was conducted in 1 plantation of each type for which annual infestation levels were recorded from 1936-1949 and which appeared to be typical of the rest of the pure and mixed plantations. Many Sitka spruce trees were dead, having been out-competed by the other trees on the site as a result of repeated top-killing by Pissodes strobi. Most surviving spruce trees were badly deformed, showed signs of severe attack and were nonmerchantable. The plantation of pure Sitka spruce contained .apprx. 176 living Sitka spruce trees/ha, but only .apprx. 14 trees/ha were potential crop trees; the rest were suppressed or deformed. This plantation contained more volume in other volunteer conifers than in Sitka spruce. The mixed plantation developed into a merchantable stand of almost pure Douglas-fir, with only 5-6 Sitka spruce trees/ha.

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Accession: 004544805

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