Abstract
SummaryReasons for relatively free-rooting of shoots on stoolbeds compared to less-ready rooting of cuttings obtained from hedges were investigated. Leafy cuttings of apple rootstock M.9 and the easier-to-propagate MM.106 rooted better under mist when obtained from ultra- severely pruned stockplants in the form of non-earthed stools, than from conventional hedges with a permanent framework of c. 1 m. Reducing hedges to about half their normal height led to intermediate rooting, as did obtaining the cuttings from the trunks rather than the tops of bushes. Improved rooting was expressed as either an increased rooting percentage or more roots per rooted cutting. When the combination of rootstock, pruning level and propagation duration caused neither extremely high nor very low rooting, a positive response was obtained to blanching the stem bases by excluding light, as occurs when soil is placed around the stems of stool shoots. Black adhesive tape was most effective experimentally for blanching, but response...
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