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

Girdling Promotes Rooting Of Slash Pine Cuttings

When cuttings from 12-year-old slash pines were taken 2 months after girdling and chemical treatment of branches in late July, 34 percent rooted in 3 months; but only 1 percent of the ungirdled cuttings rooted. Survival figures were 66 percent and 7 percent, respectively. Poor rooting and survival of control cuttings is ascribed to low food reserves leading to needle-base senescence and death. The girdling and chemical treatment presumably forces accumulation of food reserves and precallusing. Girdled cuttings with preformed root initials generally developed large root systems within : month. Additional keywords: Vegetative propagation, growth substances, Pinus elliottii var. elliottii.


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Author(s): Robert C. Hare

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 1975