The grape 'Cabernet Sauvignon' (Vitis vinifera L.) it is used in fine wines production, being very cultivated in the South of Brazil. This variety is very sensitive of occurrence of diseases, being necessary the development of cultural practices to reduce the incidence of the same ones. The objective of this work was to evaluate the productivity and the quality of the grape 'Cabernet Sauvignon' cultivated under covering of plastic in organic production system. The experiment was accomplished in an organic orchard in the west area of the state of Paraná; the plants were conducted in espalier system, with plastic covering in the planting line. It was evaluated tenor of soluble solids (SS), titrable acidity (TA), pH, total antocyanins, productivity, number of bunches for plant and medium bunch weight. They were not found significant differences in the tenor of SS (17.3ºBrix), however the fruits under the covering presented larger tenors of TA and pH, 1.14 g 100 mL-1 and 3.4 respectively, that those picked from plants without the plastic covering, which presented TA of 0.87 g 100 mL-1 and pH of 3.5. The largest tenor of total antocyanins was verified in the plants out of the covering, with 22.8 mg L-1. In the protected plants, the production was larger (1769 g plant-1) than in the plants without covering (492 g plant-1), which presented high index of diseases. It is concluded that the plastic covering makes possible the cultivation of grape 'Cabernet Sauvignon' in the organic production system, for providing a decrease in the incidence of diseases.
Viticulture; plastic greenhouse; Vitis vinifera; enology