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Site Character and Infection Hazard for the Sweetfern Rust Disease in Northern Ontario

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The vegetative and physiographic site characters of jack pine (Pinus banksiana Lamb.) stands, and their relation to the hazard of infection by the sweetfern rust disease (Cronartium comptoniae Arth.), were investigated. Cankers caused by the disease were prevalent only when the alternate host, sweetfern (Comptonia peregrina [L.] Coult.), was present, and the percentage of pine with cankers was principally a function of the abundance of sweetfern. Models for predicting sweetfern abundance indicated an affinity for dry sites that are low in certain soil nutrients. Models for rating disease hazard were dominated by sweetfern abundance or by characters that functioned to predict sweetfern abundance. Disease hazard models, however, indicated additional epidemiological roles for certain nutrient and soil characters. Sweet gale (Myrica gale L.), another alternate host for the rust, was recorded in only two stands. The percentage of pine cankered was low in both stands; hence, this host seems unimportant in northern Ontario. Forest Sci. 29:771-778.

Keywords: Comptonia peregrina; Cronartium comptoniae; Myrica gale; Pinus banksiana; jack pine; linear and nonlinear regression; sweet gale; sweetfern; sweetfern rust

Document Type: Journal Article

Affiliations: The College of Agricultural and Life Sciences, University of Wisconsin, Madison, WI

Publication date: December 1, 1983

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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