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Lodgepole Pine Dwarf Mistletoe in the Intermountain Region. James T. Hoffman, Plant Pathologist, State and Private Forestry, USDA Forest Service, Boise, ID 83702. E. Lagrande Hobbs, Professor and Chairman, Department of Botany, Weber State College, Ogden, UT 84408. Plant Dis. 69:429-431. Accepted for publication 17 November 1984. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1985. DOI: 10.1094/PD-69-429.

During 1978 and 1979, a survey of lodgepole pine dwarf mistletoe (Arceuthobium americanum) was conducted in 11 national forests in Utah, Nevada, southern Idaho, and western Wyoming. Incidence of the parasite by national forest ranged from 17 to 79% with a weighted mean of 60% of surveyed plots. Computer-simulated yield information derived from survey data indicated that annual volume reduction of lodgepole pine by dwarf mistletoe varies among national forests from 16,040 to 100,420 m3. The total timber volume yield reduction caused by lodgepole pine dwarf mistletoe in the Intermountain Region is estimated at 488,120 m3 a year.