Natural Inactivation of Blister Rust Cankers on Western White Pine
Natural inactivation was assessed for 7 years in a population of more than 1,700 blister rust (Cronartium ribicola) cankers on western white pine (Pinus monticola) at 49 locations. Of lethal-type cankers (those in the bole or expected to reach the bole) that became inactive during the study, about 78 percent remained so. At the conclusion of the study, 33 percent of lethal-type cankers were inactive and 12 percent of infected trees were potentially saved because all cankers on them were inactive. Lack of fruiting by C. ribicola and the presence of the purple mold (Tuberculina maxima) were significantly related to subsequent inactivation. Significant differences in percent of cankers inactive existed among locations. FOREST SCI. 23:343-350.
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Document Type: Journal Article
Affiliations: Research Forester, Intermountain Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Ogden, Utah 84401
Publication date: 01 September 1977