Avaliação agronômica, fitossanitária e físico-química de variedades de uvas resistentes a doenças (PIWI) produzidas na Região Sul do Brasil

Abstract

The objective of this work was to study and evaluate at agronomic and enological level a group of grape varieties resistant to fungal diseases called (PIWI), as well as to identify the progress of incidence and severity of anthracnose, downy mildew and bunch rot in the southern region of Brazil. The work was developed in Epagri-Estação Experimental de Videira, where 8 varieties (white and red) were evaluated and compared with a traditional vinifera 'Sauvignon Blanc' and 'Isabel' Vitis Labrusca used as phytosanitary comparasion standard. The topics were addressed through articles. The first related to the phenological, productive, and qualitative aspects of two white varieties, ‘Fleurtai and Sauvignon Kretos’. The ‘Fleurtai’ variety stood out for the highest number of bunches and SS levels. ‘Sauvignon Kretos’ showed higher average mass of bunches, production (kg) and productivity (t ha-1 ). The second theme referred to the agronomic, physicochemical and resistance behavior of four PIWI red varieties, 'Cabernet Eidos', 'Cabernet Volos', 'Merlot Kanthus' and 'Merlot Khorus'. The PIWI varieties 'Cabernet Volos' and 'Merlot Khorus' stood out in all the variables evaluated over two cycles. As for the epidemiological variables of downy mildew, they showed the lowest severity, indicating greater resistance. And in the productive aspects, a higher number of bunches, production and productivity, in addition to having the highest levels of SS and total polyphenols, aspects that are desired when thinking about high quality winemaking. The information gathered throughout the study period demonstrates that the cultivation of PIWI varieties in the southern region of Brazil is a strategy and study that should be intensified because of the potential presented by this group of varieties.