Phytophthora Root Rot of Port-Orford-Cedar in California. John T. Kliejunas, Plant Pathologist, Forest Pest Management, Forest Service, U.S. Department of Agriculture, San Francisco, CA 94111. David H. Adams, Forest Pathologist, Department of Forestry, State of California, Sacramento 95814. Plant Dis. 65:446-447. . 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, 1981. DOI: 10.1094/PD-65-446.

The Port-Orford-cedar stands on federal, state, and private lands in northern California were surveyed in the spring of 1980 for Phytophthora root rot caused by Phytophthora lateralis. The disease was present at six sites on the Gasquet Ranger District, Six Rivers National Forest, and Jedediah Smith Redwoods State Park, Del Norte County, and on six ornamental cedars at a residence in Eureka, Humboldt County.