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