The aim of this study was to evaluate the concentrations of indole-3-butyric acid (IBA) in hardwood cuttings of promising grapevine rootstocks for southern Brazil. Plant material was collected from selected plants from the grapevine rootstock collection of EPAGRI Experimental Station, in the city of Videira - SC . The experiment was conducted in a greenhouse during the period from July to October 2013. The experimental design was completely randomized with 20 treatments arranged in a 4x5 factorial scheme, consisting of four rootstocks ( VR043-43, Dogridge, Richter 99 and EEV793-5 ) and five IBA concentrations ( 0 , 1.000 , 2.000, 3.000 and 4.000 mg L- 1). After 60 days, it was evaluated the rooting percentage, the number, length and the fresh weight of the roots. The use of IBA increased rooting percentage, number, length and fresh weight of roots for all rootstocks. The rootstock VR043-43 showed better root development than the other rootstocks studied. To propagate the four cultivars of grapevine rootstocks evaluated via hardwood cuttings it is recommended the use of IBA at 1000 mg L- 1.
viticulture; indole-3-butyric acid; propagation
