Factors Affecting Rooting Of Fraser Fir And Virginia Pine Cuttings

Current research is focused on determining optimum season, auxin type, IBA or NAA, and concentration to use in order to promote root initiation and subsequent rooted cutting growth. Seven concentrations (1 - 64 mM) of each auxin type, 4 combinations of concentrations of both auxin types and a non-auxin control are being tested for winter, spring and fall cuttings collected from juvenile material. Additionally, research is focused on the production and rooting of vertically oriented (non-plagiotropic) shoots from older trees of these two species. Fraser firs have been hedged to 1 whorl (trees 3 and 5 years in the field) or 1, 3, and 5 whorls (trees 7 years in the field). Virginia pines, 3 years in the field, have been cut to 25, 50 and 75% of their total height. Non-cut controls of both species were also selected. During summer 2001, cuttings from both of these species will be collected and rooted to help understand how to optimize the production and rooting of these two species by managing the 1) stumping height, 2) crown position and 3) age of the parent tree.

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Author(s): Christopher L. Rosier, John L. Frampton, Barry Goldfarb

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 2001

Section: Posters