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Propagation of Western Larch by Stem Cuttings

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Seed shortages have hampered the artificial regeneration of western larch (Larix occidentalis) in parts of the interior Pacific Northwest. Mass vegetative propagation of this valuable timber species could provide a more reliable supply of reforestation material and enhance genetic gain in early larch selections. Earlier attempts to root stem cuttings of western larch achieved relatively low rates of success. In this study, indolebutyric acid (IBA) treatments resulted in rooting of more than 70% of the late-summer semi-hardwood cuttings from 1.5-year-old seedlings compared to less than 20% rooting with the spring-harvested softwood cuttings. Rooting exceeded 80% when stem caliper was greater than 2.0 mm. IBA best enhanced rooting rate and quality when applied at 16,000 ppm. High rooting rates suggest that mass propagation of western larch is feasible, but growth and form of the rooted cuttings require additional assessment. West. J. Appl. For. 6(2):47-49.
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Document Type: Journal Article

Affiliations: Department of Forest Resources, College of Forestry, Wildlife and Range Sciences, University of Idaho, Moscow, Idaho 83843

Publication date: 01 April 1991

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