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    Author(s): F. Thomas Ledig
    Date: 1976
    Source: Forest Science 20(1):2-16
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (1.7 MB)


    The commonly applied comparison-tree method of selection is analyzed as a form of within-family selection. If environmental variarion among comparison- and select-tree groups, c2, is a relatively small proportion (17 percent or less with 5 comparison trees) of the total variation, comparison-tree selection will result in less genetic improvement than individual-tree selection, Even if c2 is large, individual-tree selection may be more effective than comparison-tree selection if comparison and candidate trees are related. Estimates of c2 and of relationships among trees in wild stands derived mainly from published reports suggest that comparison-tree selection may in fact result in less genetic gain than individual-tree selection in many tree species. In any case, comparison-tree selection will seldom be much more effective than individual-tree selection. Development of allernate techniques for applying cite corrections in the selection of superior trees is suggested.

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    Ledig, F. Thomas. 1976. An analysis of methods for the selection of trees from wild stands. Forest Science 20(1):2-16


    Pinus rigida, base-line selection, phenotypic selection

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