Radial growth in grand fir and Douglas-fir related to defoliation by the Douglas-fir tussock moth in the Blue Mountains outbreak.

B.E. Wickman; D.L. Henshaw; S.K. Gollob

doi:10.2737/PNW-RP-269

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Radial growth in grand fir and Douglas-fir related to defoliation by the Douglas-fir tussock moth in the Blue Mountains outbreak.

Informally Refereed

Authors:

B.E. Wickman, D.L. Henshaw, S.K. Gollob

Year:

1980

Type:

Research Paper

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RP-269

Source:

Res. Pap. PNW-RP-269. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 23 p

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Download (PDF 1.62 MB): https://research.fs.usda.gov/download/treesearch/21251.pdf

Abstract

Radial growth reduction related to amount of tree defoliation was studied following a severe tussock moth outbreak. Growth sharply declined the year after defoliation began, and amount of decline was proportional to percent defoliation. Growth recovery began the year after defoliation ceased and radial increment had returned to pre-outbreak levels 5 years after defoliation.

Keywords

Increment (radial), defoliation damage, insect damage (-forest, Douglas-fir tussock moth, Orgyia pseudotsugata, grand fir, Abies grandis, Douglas-fir, Pseudotsuga menziesii, Oregon (Blue Mountains), Washington (Blue Mountains)

Citation

Wickman, B.E.; Henshaw, D.L.; Gollob, S.K. 1980. Radial growth in grand fir and Douglas-fir related to defoliation by the Douglas-fir tussock moth in the Blue Mountains outbreak. Res. Pap. PNW-RP-269. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 23 p