The viticulture of the north of Parana state differs from other regions, because in this area two crops are obtained a year, a regular and an out of season ones. However, the hot and humid climate of the region favors the occurrence of downy mildew (Plasmopara viticola), an alternative to minimize this problem is the use of grape production under protected cultivation. The study aimed to evaluate the out of season production of grapevine 'BRS Clara' on 'IAC 572 Jales' and 'IAC 766 Campinas' rootstocks, submitted to different types of protected cultivation. The randomized block design was used as a statistical model with four replications arranged in a factorial 7x2 (seven kinds of protected cultivation and two rootstocks). The treatments were: a. plastic screen without fungicides for downy mildew; b. plastic screen with fungicides for downy mildew (standard control of the region); c. plastic cover without fungicides for downy mildew; d. plastic cover and 50% of reduction of the standard fungicides for downy mildew; e. plastic cover and 75% of reduction for the standard fungicide mildew; f. plastic cover with phosphite and copper and; g. plastic cover without fungicides. The rootstocks 'IAC 766' and 'IAC 572' are suitable for the production of 'BRS Clara' in north of Parana state; the use of plastic cover allows a reduction up to 75% of the number of applications of fungicides in 'BRS Clara'; the plastic cover itself is not sufficient to prevent the occurrence of downy mildew in bunches under conditions of high humidity.
viticulture; plastic sheeting; seedless grape; productivity
