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Rapid Method of Rating Forest Trees for General Resistance to Foliar Pathogens

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A simple and rapid method of rating forest trees for general resistance to foliar pathogens was tested. Rapidity of taking and recording data is especially important where many individuals must be scored at frequent intervals and where the amount of disease on that individual plant may change quickly with time, as was the case in this investigation. The system directly compares, over time, the relative amount of disease on a single plant with all other plants in this test. The Pinus ponderosa Laws : Scirrhia acicola (Dearn.) Siggers association (brown-spot needle blight of ponderosa pine) was used in evaluating the rating method. Results, based on one judge's evaluation during one disease cycle, indicate that the method is repeatable over location. Furthermore, measurement of general resistance to brown-spot of individual ponderosa pine trees is possible regardless of the amount of disease. The time that it took to take notes on a plantation using this method was only a fraction of what would have been required if the evaluations had been made using conventional note-taking methods. With experience, one can rate individual plants, with the aid of a tape recorder, while walking through the plantation at a comfortable pace. This method makes the evaluation of large numbers of trees feasible in terms of time and cost. Forest Sci. 29:215-221.
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Keywords: Pinus ponderosa; Scirrhia acicola

Document Type: Journal Article

Affiliations: Professor Emeritus, Department of Plant Pathology, College of Agriculture, University of Missouri, MO 65211

Publication date: 1983-06-01

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    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.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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