Efeito da desfolha na produtividade e qualidade físico-química de uvas

Abstract

The cultivation of grapevines has been growing in Brazil in the last decades, especially in the south of the country. As in other fruit species, the development and production of the grape can be affected by biotic and abiotic factors, such as the practice of defoliation. Thus, the objective of this study was to evaluate the influence of defoliation on some yield components and physical-chemical quality attributes of the grapes. The research was carried out through the collection of grapevine plants implanted in the Federal Technological University of Paraná, Campus Dois Vizinhos, from September 2017 to June 2018. The experimental design was a randomized block design in a 3 x 2 two-factor scheme (cultivars x defoliation) with four replications of two plants each. The treatments were with defoliation and without defoliation applied in the cultivars BRS Violeta, Niagara Rosada and Isabel Precoce. The productivity of the grapes was low in the three cultivars evaluated, indicating inadequate climatic adaptation of the same to the local climate. The defoliation of the plants did not affect the productivity, the chemical quality of the grapes nor the predisposition to pests and diseases damages in the grapes during maturation. The Niagara Rosada cultivar was shown to be more susceptible and, Isabel Precoce, less susceptible to the attack of plagues and rot during the maturing of the grapes. The cultivar BRS Violeta presented a better ratio.