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Improved Vegetative Propagation of Scouler Willow

Demand has exceeded supply for conservation plantings of Scouler willow (Salix scouleriana Barratt ex Hook.). To test possible ways to improve propagation, we treated 8- to 10-cmlong (3.2- to 4.8-in-long) hardwood cuttings with 0.0, 0.1, 0.3, 0.8, and 1.6% indole-3-butyric acid (IBA), and 5- and 10-cm-long (2- to 4-in-long) softwood cuttings, with 0.0 and 0.3% IBA. Best rooting (73% and 87% ) occurred after treatment with 0.3% IBA in the hardwood and 10-cm long softwood cuttings, respectively. Microshoots were tested with the antibiotic cefotaxime and calcium gluconate to control bacterial contamination and shoottip necrosis. Microshoots, with or without naphthaleneacetic acid (NAA), rooted up to 92% both in and ex vitro without NAA. Similar micropropagation options may improve production of other difficult to propagate willows.

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Author(s): John L. Edson, Annette D. Leege-Brusven, David L. Wenny

Publication: Tree Planters' Notes - Volume 46, Number 2 (1995)

Volume: 46

Number: 2