Skip to Main Content
A method for sampling western spruce budworm pupae.Author(s): Nilima Srivastava; Roy C. Beckwith; Robert W. Campbell; Torolf R. Torgersen
Source: Res. Note PNW-RN-372. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station 6 p
Publication Series: Research Note (RN)
Station: Pacific Northwest Research Station
View PDF (88 KB)
DescriptionPupal density of western spruce budworm, Choristoneura occidentalis Freeman, can be accurately estimated from 45-cm branch tips. Density on tips was representative of densities on entire branches. Mean pupal densities on branch tips are statistically different from lower, mid, and upper crowns (p = .07). Therefore, multi-crown sampling is required to precisely estimate the mean of populations similar to those used in this study.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationSrivastava, Nilima; Beckwith, Roy C.; Campbell, Robert W.; Torgersen, Torolf R. 1981. A method for sampling western spruce budworm pupae. Res. Note PNW-RN-372. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station 6 p
KeywordsPopulation sampling, insect surveys, sampling methods, insect populations, western spruce budworm, Choristoneura occidentalis
- Sampling western spruce budworm by counting larvae on lower crown branches.
- Sampling western spruce budworm larvae by frequency of occurrence on lower crown branches.
- Monitoring larval populations of the Douglas-fir tussock moth and the western spruce budworm on permanent plots: sampling methods and statistical properties of data
XML: View XML