Selecting sampling points for larvae of western spruce budworm, Choristoneura occidentalis (Lepidoptera: Tortricidae), from survey records in British Columbia
Annual counts of larvae of western spruce budworm, C. occidentalis Free., from beating samples of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) were analyzed over 30 years. Sampling points which most frequently yielded high budworm counts and also had detectable defoliation were analyzed and co...
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Veröffentlicht in: | Journal of the Entomological Society of British Columbia 1981-01, Vol.78, p.7-9 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Annual counts of larvae of western spruce budworm, C. occidentalis Free., from beating samples of Douglas-fir (Pseudotsuga menziesii (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. |
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ISSN: | 0071-0733 |