The production of table grapes has been facing some challenges that require changes in production technologies, primarily due to the intense need to control fungal diseases. The aim of this study was to evaluate the ripening of 'BRS Clara' grapevines grafted on IAC 766 'Campinas' rootstock, under protected cultivation grown out of season. The experiments were performed at Uraí and Marialva, Paraná State, Brazil. The chemical characteristics of the berries such as soluble solids, titratable acidity, maturation index and pH were evaluated weekly from early ripening to harvesting, in two protected cultivation systems: under plastic cover and under plastic screen. The randomized design was used as a statistical model, in both experiments, with seven replications. The berry ripening evolution was compared by means of regression analysis. In both experimental areas, the plastic cover enabled earlier grape harvest (in six days) as compared to the plastic screen, being the harvest based on the soluble solids content. The plastic cover did not modify the maturation index of the berries of 'BRS Clara'.
Seedless grape; protected cultivation; ripening; Plasmopara viticola
