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

A Tree Improvement Program to Develop Clones of Loblolly Pine for Reforestation

The program emphasizes resistance to fusiform rust (Cronartium quercuum) (Berk.) Miyabe ex Shirai F. sp. fusiforme) as well as volume production of loblolly pine (Pinus taeda L). Parent trees are selected from a tested first generation population and crossed. A controlled-environment screening technique serves as an early selection for disease-free individuals and provides family information for later selection. Rust-free seedlings enter a vegetative propagation system using rooted cuttings. Clonal progeny tests, planted at multiple sites, provide data for later selection. Clonal selections are made using information derived from controlled-environment rust testing as well as field tests. The selections produce two populations: a clonal production population and a breeding population. The two populations may contain different subsets of selections since the one is selected mainly for general combining ability while the other is selected for total genetic value.


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Author(s): G. Sam Foster, D. V. Shaw

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