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An Alinement Chart for Estimating Number of Needles on Western White Pine Reproduction

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Since its introduction into the West at Point Grey, British Columbia, in 1910 white pine blister rust has spread rapidly, and is now a major factor in the management of western white pine stands in northern Idaho. To study the relations between this species and ribes, the alternate host for white pine blister rust, some measure of the target afforded by the pines is imperative. The number of needles on a tree is the logical basis for indicating the target presented, since it is through the needles that pine infection takes place. The purpose of this paper is to make available a chart from which the number of needles presented by large numbers of white pine trees can be determined from measurements of crown length and crown width of the respective trees, correction factors being applied for abnormal trees.
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Document Type: Journal Article

Affiliations: Division of Forest Pathology, Bureau of Plant Industry, Portland, Oregon

Publication date: 1936-06-01

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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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