Radial Growth in Grand Fir and Douglas-fir Related to Defoliation by the Douglas-fir Tussock Moth in the Blue Mountains Outbreak
Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1980 - Abies grandis - 23 pages
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additional aerially mapped defoliation amount appendix average radial growth basal area began Blue Mountains caused cent compared comparison damage defo defoliated 50 percent DEFOLIATED DOUGLAS-FIR DEFOLIATED GRAND FIR defoliated host trees defoliated trees defoliation classes determined DFTM diameter differences Douglas-fir tussock moth effects of defoliation ENVIRONMENTAL FACTORS estimate examined exhibited expected growth Figure fir and Douglas-fir fir defoliated Forest four greater growth decline growth loss growth of defoliated growth of Douglas-fir growth of grand growth patterns growth rate growth recovery heavy defoliation immediately included increased increment indicate individual tree defoliation larch less liated liation light measurements method moderate non-defoliated host trees non-host trees occurred Oregon outbreak growth outbreak period percent defoliation percent growth reduction pine plots post-outbreak growth post-outbreak period pre-outbreak growth precipitation record relationships result sample severely defoliated showed similar species spruce stands suffered top-kill tree defoliation categories trend Washington Wickman l978a