Selecting sampling points for larvae of western spruce budworm, <i>Choristoneura occidentalis</i> (Lepidoptera: Tortricidae), from survey records in British Columbia

Authors

  • J. W. E. Harris Environment Canada Canadian Forestry Service Pacific Forest Research Centre Victoria, B.C.
  • A. F. Dawson Environment Canada Canadian Forestry Service Pacific Forest Research Centre Victoria, B.C.
  • R. G. Brown Environment Canada Canadian Forestry Service Pacific Forest Research Centre Victoria, B.C.

Keywords:

western spruce budworm, <i>Choristoneura occidentalis</i>, Lepidoptera, Tortricidae

Abstract

Annual counts of larvae of western spruce bud worm, <i>Choristoneura occidentolis</i> Free., from beating samples of Douglas-fir (<i>Pseudotsuga menziesii</i> Mirb.) Franco) were analyzed over 30 years. Sampling points which most frequently yielded high budworm counts and also had detectable defoliation were analyzed and compared with results from all the samples. When the purpose of sampling was to predict populations, the 98 points sampled since 1949 could be reduced to 17, thus enabling a significant reduction in the cost of data collection.

References

Harris, J.W.E., D.G. Collis, and K.M. Magar. 1972. Evaluation of the tree-beating method for sampling defoliating forest insects. Can. Ent. 104:723-729.

Harris, J.W.E. 1976. Storage and retrieval of quantitative British Columbia-Yukon Forest Insect and Disease Survey records. Pacific Forest Research Centre, Victoria. Report BC-X-120. 30 pp.

Shepherd, R.F., J. Harris, A. Van Sickle, L. Fiddick, and L. McMullen. 1977. Status of western spruce budworm on Douglas-fir in British Columbia September 1977. Pacific Forest Research Centre Pest Report. 14 pp.

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Published

2019-08-28

Issue

Vol. 78 (1981): Journal of the Entomological Society of British Columbia

Section

Articles

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