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Inactivation of Lethal-Type Blister Rust Cankers on Western White Pine

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Inactivation of blister rust cankers on western white pine was evaluated throughout the Inland Empire in a 1965 survey of 48 young stands, not treated with antibiotics. Sixty-two percent of all lethal-type cankers sampled were inactive. In open stands, 67 percent were inactive compared to 60 percent in other stands; in dominant and codominant trees 66 percent were inactive compared to 51 percent in intermediate and suppressed trees. Percentage inactivation was correlated with age of cankers. No cankers less than 4 years old were found to be completely inactive; but 50 percent of the cankers were completely inactive at 8 years. 76 percent at 16 years, and 90 percent at 24 years. Aecial production was reduced to 14.2 percent of potential on active lethal cankers and to 5.4 percent of potential for the entire lethal-type canker population. Tuberculina maxima, believed to be the principal cause of the surveyed inactivation, was found fruiting on 24 percent of the active lethal-type cankers.
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Document Type: Journal Article

Affiliations: Principal Plant Pathologist, retired. U.S. Dept. Agric., Forest Service, Intermountain Forest and Range Expt. Sta., Ogden, Utah.

Publication date: 1969-05-01

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

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