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

Genetic Improvement of Pines in the States of Chihuahua and Durango, Mexico

Tree improvement programs in Chihuahua and Durango began in 1987 and 1986, respectively. Priority species are Pinus arizonica, P. durangensis, and P. engelmannii plus, in Durango, P. cooperi and as lower priority, P. herrerae and P. teocote. Based on annual precipitation Chihuahua has been divided into 3 regions and 11 seed zones and Durango has been divided into 5 regions and 17 zones. Eleven of the 30 seed production areas planned for Chihuahua have been established so far. In Chihuahua we plan to select 1000 superior phenotypes of each species and selection work is underway. Clonal orchards will be established with 30-50 of the best selections from each seed zone. All selections will be progeny tested. In Durango 20 seed production areas have been developed and more than 400 superior trees have been selected. Progeny test seedling orchards will be the core of the Durango program with first generation goals of more than 6000 parents in the tests. Plans are to establish breeding populations of 180-200 parents per seed zone divided into 3 or 4 subpopulations. Keywords: Pinus arizonica, Pinus durangensis, Pinus engelmannii, seed zones, seed orchards.

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Author(s): Knud E. Clausen, Hans Nienstadet, T. Eguiluz

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1989

Section: General Session: Tree Improvement Programs