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Phytophthora Shoot Blight and Canker Disease of Abies spp.. Arthur H. McCain, Extension Plant Pathologist, Department of Plant Pathology, University of California, Berkeley 94720. Robert F. Scharpf, Research Plant Pathologist, Pacific Southwest Forest and Range Experiment Station, USDA Forest Service, Berkeley, CA 94720. Plant Dis. 70:1036-1037. Accepted for publication 2 May 1986. 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, 1986. DOI: 10.1094/PD-70-1036.

Phytophthora citricola was identified as the cause of a shoot blight and canker on Abies concolor and A. magnifica. A. concolor suffered twig and branch dieback, but in A. magnifica, the fungus also entered stems through branch infections, causing top dieback and mortality. The disease was observed only in trees sprinkler-irrigated with ditch water during the spring flush of growth.