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Revista Brasileira de Fruticultura
Print version ISSN 0100-2945
SCARPARE FILHO, João Alexio; MORAES, André Luis de; RODRIGUES, Alessandro and SCARPARE, Fábio Vale. 'Niagara Rosada' grapevine yield under defoliation. Rev. Bras. Frutic. [online]. 2010, vol.32, n.3, pp.778-785. Epub Oct 01, 2010. ISSN 0100-2945. http://dx.doi.org/10.1590/S0100-29452010005000105.
The objective of this work was verify the effect of defoliation in 'Niagara Rosada' grapevine between harvest and natural leaf fall period make influence on yield to next cycle. After harvest, December-2005, there were selected plants with eight production branches. The treatments were represented by plants under two artificial defoliation intensity (25% and 50%) in four dates after harvest (30, 45 60 and 75), plants without artificial defoliation under chemical protection and plants without defoliation and without chemical protection. Two production cycles were appraised: dry pruning, from July-2006 until December-2006 (harvest) and green pruning, from February-2007 until June-2007 (harvest). Shots growth, number of bunches per plant and yield (kg.plant-1) were analyzed in both cycles. The regression analyses were done considering the intensity of defoliation. The intensity of defoliation after harvest reduces future yield for next cycles, however it does not show influence on shots growth and to the number of bunches per plant. Dry pruning yield was bigger than green pruning yield
Keywords : Vitis labrusca L.; defoliation intensity; dry pruning; green pruning.