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Dwarf Mistletoes on Western White Pine and Whitebark Pine in Northern California and Southern Oregon

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Western white pine (Pinus monticola) is a principal host of Arceuthobium californicum in the Siskiyou Mountains of northern California and southern Oregon, and suffers extensive mortality in some stands. Whitebark pine (P. albicaulis) is a principal host and western white pine is a secondary host for A. cyanocarpum in northern California. Mortality of whitebark pine caused by this dwarf mistletoe on Mount Shasta, California, is as high as 58%. Western white pine is occasionally infected in A. tsugense-infested mountain hemlock stands in California and southern Oregon. However, no infection of western white pine occurred in A. tsugense-infested western hemlock stands in southern Oregon, indicating there are physiologically distinct races of A. tsugense parasitizing western hemlock and mountain hemlock. For. Sci. 34(2):429-440.

Keywords: Arceuthobium californicum; Arceuthobium cyanocarpum; Arceuthobium tsugense; Pinus albicaulis; Pinus monticola; Tsuga heterophylla; Tsuga mertensiana; damage

Document Type: Journal Article

Affiliations: Forest Pathologist, USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort Collins, CO 80526

Publication date: June 1, 1988

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