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The Stalactiform Rust on Jack Pine

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The stalactiform rust caused elongate diamond-shaped cankers on pole-sized and mature lack pine. Symptoms on seedlings are not always distinguishable from C. comptoniae or C. comandrae. Nine-week-old seedlings were inoculated with C. quercuum, C. comptoniae, C. comandrae, and P. stalactiforme. Mortality seven years after inoculation was 36, 68, 77, and 74 percent respectively. Little decay was found behind the stalactiform rust cankers. A dissection study of 56 cankers on 46-year-old trees indicated that only 2.6 cubic feet of red rot had developed caused by Fomes pini. Mortality, in pole-sized and mature trees is rare. Nursery infection appears to be the most serious aspect of this disease. Pycnia form from mid August until mid October and aecia the following spring. On mature trees, rodents feed on pycnia which develop on the canker margins. In many cases this feeding appears to have arrested canker development.
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Document Type: Journal Article

Affiliations: Principal Plant Pathologist, Lake States Forest Expt. Station, Forest Service, U.S. Dept. Agric., St Paul, Minn.

Publication date: 1967-06-01

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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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