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

Evaluation Of Slash Pine For Resistance To Pitch Canker

Two- to three-year-old orchard open-pollinated seedlings from 46 slash pine (Pinus elliottii Engelm. var. elliottii) clones were evaluated for resistance to Fusarium moniliforme var. subglutinans (FMS). These families, representing fast growing and/or fusiform rust resistant genotypes, were planted near Gainesville, Florida. Terminal and lateral shoots of 21 to 24 seedlings per family were wounded and inoculated with a polymix of four isolates of FMS. Family mean symptom expression ranged from 16.6 to 91.7%; shoot mortality ranged from 4.2 to 91.7%. Strong individual and family heritabilities suggested that genetic resistance may be useful in management of pitch canker. Estimated gains from four improvement options are presented. There were no significant correlations between pitch canker resistance and either fast-growth or fusiform rust resistance.


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Author(s): C. H. McRae, Donald L. Rockwood, George M. Blakeslee

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1985