Abstract
The aim of this study was to evaluate the different degrees of tolerance to infection by P. viticola among three genotypes with constitutive resistance in comparison to susceptible varieties Vitis vinifera . For this purpose two experiments was conducted at EPAGRI Experimental Station, located in the city of Sao Joaquim, Santa Catarina State, at 2015/16 cycle. In the first experiment on the field, were quantified the incidence and severity and downy mildew intensity was compared by epidemiological variables, on the tolerant varieties Bronner, Regent, Cabernet Cortis and the susceptible Sangiovese. On the second experiment forty leaf discs for the same tolerant genotypes and the susceptible variety Chardonnay were artificially infected with P. viticola sporangia suspension and after seven days of incubation the discs were examined and the degree of infection was estimated based on the intensity of sporangiophore formation. Sangiovese showed highest downy mildew intensity in comparison to the tolerant varieties Cabernet Carbon, Regent and Bronner. Under controlled conditions, the susceptible variety Chardonnay showed higher sporangiophore formation on discs leafs in comparison to the tolerant varieties. All the downy mildew tolerant varieties evaluated showed lower disease development in comparison with V. vinifera varieties.
Highlights
Santa Catarina State wine industry is gaining strong space on the national scene, especially in highland regions (900 m a.s.l.)
Downy mildew, caused by the obligately biotrophic peronosporomycete Plasmopara viticola (Berk. and Curt.) Berl. and de Toni., is among of the most destructive grapevine diseases, that occurs worldwide, in warm and humid climates [4]. This condition often occurs in highlands regions of Santa Catarina State during the vine growing cycle
The aim of this work was to evaluate the different degrees of tolerance to infection by P. viticola among three genotypes with constitutive resistance in comparison to susceptible variety Vitis vinifera in highlands of Santa Catarina State
Summary
Santa Catarina State wine industry is gaining strong space on the national scene, especially in highland regions (900 m a.s.l.). The climatic potential of these regions for grape production (Vitis vinifera L.) has been proven by several researches [1,2,3]. These conditions provide distinctive climate compared to other grape-growing regions of Brazil, shifting the vine phenological cycle [1]. De Toni., is among of the most destructive grapevine diseases, that occurs worldwide, in warm and humid climates [4]. This condition often occurs in highlands regions of Santa Catarina State during the vine growing cycle
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