Cultivo fora de época da videira BRS Clara sob cobertura plástica

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

25/02/2011

RESUMO

The system of production of grapes under plastic cover is an alternative to reduce pesticide treatments in table grapes in Northern Paraná, once that the hot and humid climate favors the occurrence of fungal diseases, especially during the out of season crop. The aim of this study was to evaluate the ripening evolution, the physico-chemical characteristics of the berries and the production of the ‘BRS Clara’ grapevines grafted on IAC-766 ‘Campinas’ rootstock under protected cultivation grown out of season, in order to reduce the application of pesticides to control downy mildew (Plasmopara viticola). The experiments were conducted in commercial vineyards located at Uraí and Marialva-PR. In both experiments the vines were trained in an over-head trellis system, in a spacing of 4.0 x 4.0 m in Uraí, and 2.0 x 5.0 m in Marialva-PR. The randomized design was used as a statistical model, in both experiments, consisted of two protected cultivation (under plastic cover and under plastic screen) and seven replications. In the experiment conducted in Uraí, the berries weight was higher in vines grown under plastic screen (3.7 g). No difference was verified for the mass of the clusters, neither for the production and productivity of grapevines. For the chemical characteristics of the berries, no difference was observed for the content of total soluble solids, maturation rate and pH; however, there was higher acidity under plastic cover (0.7%). It was verified the occurrence of downy mildew just on the leaves, which the incidence and severity was lower in vines under plastic cover (0.5 and 0.02% respectively). In Marialva, the length of the clusters was higher under plastic cover (18.4 cm), while the mass of the berries was higher under plastic screen (3.8 g). There was no influence of both coverages in the mass of clusters, production and productivity of grapevines. For the chemical characteristics of the berries, the content of total soluble solids (19.6 Brix) and pH (3.5) were higher under plastic cover, and there was no difference in acidity and maturation rate. It was not detected the occurrence of fungal diseases in any of the systems of protected cultivation. In both areas, the harvest was possible to be advanced in six days in vines under plastic cover in relation to plastic screen. It was concluded that the use of plastic cover allows the reduction of the number of pesticides applications to control downy mildew, without changing the physico-chemical quality of the berries and the productivity of ‘BRS Clara’, in addition to enable the anticipation of the harvest and to contribute to environmental preservation.

ASSUNTO(S)

uva - cultivo cobertura plástica videira - cultivo videira - maturação videira - produção viticulture plastic cover

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