Cutting type (with a wound; with a node or an internode in the basal portion), indolbutiric acid concentrations (IBA) (zero, 500, 1,000 and 2,000 mg/L) and leaf area (zero; 25; 50; 75 and 100 cm2) effects have been evaluated in semihardwood cuttings of grapevine rootstocks. Cutting type has not significantly affected neither rooting percentage nor leaf retention, but a higher root number/cutting has been found in `Jales' (with a wound) and in `Campinas' (with a node in the basal portion). Similar results have occurred as to the IBA concentrations used, however, the higher ones have led to increase in cutting mortality. No rooting has been observed in leafless cuttings but trends of increasing budding and decreasing mortality have been detected in the presence of the higher leaf areas. Plants resulting from semihardwood cuttings have shown stalk diameter inadequate for winter grafting. Finally, results have indicated that rooting semihardwood cuttings is effective for rapid multiplication of grapevine rootstocks but does not allow grafting in the same year.
grapevine; rootstocks; cuttings; auxin; rooting
