A canker disease of young Douglas firs became epidemic in the northern Coast Ranges of California during 1930 because of a combination of climatic conditions unfavorable to the host and favorable to the disease. The epidemic had snbsided by 1931. It will recur again when similar conditions arise. The disease resembles a canker disease of Douglas firs in Europe, but it is apparently indigenous, or at least behaving as an indigenous disease. The damage resulting was negligible, most of the dying of Douglas fir and other species resulting from the protracted drought of 1929.
Document Type: Journal Article
Professor of Forest Pathology, Yale University and Principal Pathologist, U. S. Bureau of Plant Industry
Publication date: October 1, 1933
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