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Forest Character and Vulnerability of Balsam Fir to Spruce Budworm in Minnesota

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Vulnerability of balsam fir to damage by the spruce budworm was studied from 1956 to 1962 in northeastern Minnesota. Data on tree injury were collected annually on permanent plots in 23 balsam fir stands representing a variety of stand conditions. Multiple regression analyses of preoutbreak attributes of individual trees revealed none that explained more than 27 percent of the variation in damage. Using nine tree characteristics in a discriminant analysis resulted in misclassifying about one-fourth of the trees expected to survive. More promise in predicting mortality was shown by three stand characteristics: (a) percent basal area in spruce, (b) percent basal area in nonhost species, and (c) balsam fir basal area. These components in an equation explained 56 percent of the variation in balsam fir mortality. Though not high, this is reasonably good in view of the other sources of variation in the data. The study helps quantify the relation between forest character and spruce budworm vulnerability.

Keywords: Abies balsamea; Choristoneura fumiferana; Picea glauca; Picea mariana; stand composition

Document Type: Journal Article

Affiliations: Principal Insect Ecologist at the North Central Forest Expt. Sta., Forest Service, U. S. Dept. of Agric., St. Paul Minn.

Publication date: March 1, 1969

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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