The Stalactiform Rust on Jack Pine
Abstract: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.
Document Type: Journal Article
Affiliations: Principal Plant Pathologist, Lake States Forest Expt. Station, Forest Service, U.S. Dept. Agric., St Paul, Minn.
Publication date: June 1, 1967
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