Spread of Blister Rust to Sugar Pine in Oregon and California
Abstract:White pine blister rust was unknown on sugar pine within its natural range until 1936, when the fungus was found on this tree species at several places in Oregon and at two places a few miles across the line in California. 1936 was also the first year that the rust was found on ribes in California. During 1937, a rather wide spread of the rust to ribes occurred in the state, extending southwards for about 125 miles both in the coastal mountains and in the Sierra Nevada. The writer discusses the present known distribution of blister rust in the two states together with its behavior on sugar pine, which, according to all evidence to date, is a highly susceptible species.
Document Type: Journal Article
Affiliations: Division of Forest Pathology, Bureau of Plant Industry
Publication date: 1938-07-01
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