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U.S. Department of Agriculture USDA Forest Service Southern Regional Extension Forestry Southern Regional Extension Forestry

Early Testing and Juvenile Selection in Loblolly Pine

Two independent studies have shown that it is possible to predict heights of loblolly pine half-sib families after eight years in field tests from a single year's leader growth. Shoot elongation patterns on sixth-year leaders suggested that families have different characteristic growth strategies that may be used in early genetic evaluation. In the second study, leader growth after the free growth phase (cyclic growth) of seedlings at 31, 41 and 58 growing weeks after germination was moderately correlated (approx. +0.60) with eight-year heights of siblings in older field trials.


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Author(s): Floyd E. Bridgwater, Claire G. Williams

Publication: Tree Improvement and Genetics - Northeastern Forest Tree Improvement Conference - 1987