Yield Loss of Lodgepole Pine Stands to Dwarf Mistletoe in Colorado and Wyoming National Forests

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Abstract
From 1977-1979, a road and plot survey was conducted for A. americanum in lodgepole pine (P. contorta) stands on 9 national forests in Colorado and Wyoming. Infestation levels ranged from 0-64.0% and averaged 50.6% for all forests surveyed. Estimates of annual merchantable loss to dwarf mistletoe by forest ranged 880-101,930 m3 (0.40-1.36 m3/ha). The annual loss for these forests is estimated at 270,750 m3 (average, 0.76 m3/ha). This loss is equivalent to the annual harvest of lodgepole pine sawtimber for these national forests or at least 25% of the annual growth.

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