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Warren’s collar weevil in lodgepole pine stands in the Kispiox Forest District Byford, Geoffrey Thomas

Abstract

The distribution and abundance of Warren’s collar weevil, Hylobius warreni Wood (Coleoptera: Curculionidae), was examined in lodgepole pine, Pinus contorta var. latfolia Engelni, plantations in the Kispiox Forest District in north-central British Columbia. The effect of weevil feeding damage on height growth of dominant and co-dominant trees was also examined. The weevil was found distributed throughout the forest district. All 31 surveyed plantations, ranging in age from 5 years to 16 years, had evidence of larval feeding damage. Weevil-caused mortality ranged from 0-8.8%. The average percentage of sampled trees attacked was 29%. The percentage of trees attacked within a plantation was directly related to plantation age and average tree height. There was not a significant relationship between the thickness of the organic layer above mineral soil and the percentage of trees attacked in the first year of the study. Plantation density had no apparent effect on the percentage of trees attacked. The highest levels of weevil damage were found on circum-mesic, well drained sites in the ICHmc3 biogeoclimatic variant. Plantations established on sites which originally had a pine component appeared to be particularly susceptible to weevil damage. It appears that the collar weevil is not reducing plantations to below minimum stocking levels (

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