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Sweetfern Rust on Jack Pine

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Studies were made on the effects of the sweetfern rust, Cronartium comptonia, on the growth and development of jack pine. Mortality four years after inoculation of first year seedlings was 58 percent. The inoculation of two and three year old seedlings resulted in less than one percent infection. Dissection studies on the main stem of infected plantation grown trees indicated that infection had occurred before the trees were ten years old. In natural stands trees of all ages were killed by the sweetfern rust but mortality was greatest in mature and over mature stands, 42 and 52 percent, respectively. The height and diameter growth of infected trees was reduced by the fungus and the rust canker was an entrance point for wood decay fungi. Basal cankers caused by the sweetfern rust fungus averaged five feet in length on mature trees. Observations over a 6 year period indicated that the fungus had a very limited spread from host to host.
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Document Type: Journal Article

Affiliations: Professor, University of Minnesota, St. Paul

Publication date: 1964-07-01

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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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