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Enhanced Rooting of Woody Plant Cuttings by Mycorrhizal Fungi1


When inoculum of ectomycorrhizal fungi was added to the rooting medium, the percentage of rooted cuttings and the root volumes on cuttings of bearberry (Arctostaphylos uva-ursi L. Spreng.) and huckleberry (Vaccinium ovatum Parsh) were significantly greater than those of the uninoculated controls. This enhanced rooting occurred before or in the absence of any mycorrhizal association. In some tests, inoculum of one fungus enhanced rooting of one cultivar of bearberry, but not another, suggesting a specific interaction between the cultivar and the fungus. Of the 13 fungi tested, only Thelephora terrestris Ehrh. ex Fr. formed ectendomycorrhizae in the propagation bed, although several others did so under other conditions.