Abstract
SummaryThe rooting ability of plum rootstock hardwood cuttings inserted for one month in a peat-grit medium at 70 °F basal temperature was influenced by the depth to which they were previously dipped in an alcoholic solution of 4(indolyl-3) butyric acid (IBA). Although in detail the response varied with IBA concentration and rootstock clone, in general the highest proportion of cuttings rooted when only the basal cut end of the shoot was treated. The detrimental effect of dipping to one inch increased with increasing concentration of IBA and was shown to be caused by the application of IBA to the epidermis, since it could be eliminated by sealing the epidermis with polyvinyl resin prior to dipping or by reducing the concentration of IBA applied to the epidermis relative to that applied to the cut end. Epidermal application was only beneficial when insufficient stimulation to rooting was obtained through basally-applied IBA.
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