Incidence of grape anthracnose on different VITIS labrusca and hibrid cultivars and rootstocks combination under humid subtropical climate

Abstract

Anthracnose is a severe disease present in several grape production areas; it is considered a tropical disease. In South Brazil, high relative humidity and other conditions favor the occurrence of fungal disease in vineyards. The objective of this study was to evaluate the anthracnose incidence progress in grape leaves in three scion cultivars (Concord, Bordô and BRS Carmem) in combination with three rootstock (1103 Paulsen, VR 043-43 and IAC 766), in regional climatic conditions favorable for disease development. The experiments were carried out on ridges with semi-trellis system. The experimental design was randomized blocks, with split plots, with 4 replications and 4 plants per plot. The plots were represented by 9 different combinations. Disease incidence was assessed at two week-. At each sampling, disease was assessed 10 leaves of a same shoot of 6 plants for each cultivar/rootstock combination, for a total of 54 plants. All cultivar-rootstock combinations showed disease symptoms with highest disease incidence coinciding with the greatest amount of precipitation. Based on the relative area under the disease progress curve (AUDPC), the anthracnose incidence showed differences between seasons. Differences between rootstocks and rootstock/cultivar combinations were observed during the first and third season, but there was no consistency between the seasons, indicating that the variation in disease progress could be due to other factors, including as weather conditions, age of the vineyard and inoculum pressure.

Aetiology of anthracnose on grapevine shoots in Brazil

“…Most cultivars of V. vinifera and V. labrusca from Brazilian vineyards are susceptible to anthracnose (Giovaninni, ; Barros et al ., ). However, there have been no studies on the aetiology of the disease in the country.…”

Phylogeny, morphology and pathogenicity of Elsinoë ampelina, the causal agent of grapevine anthracnose in Brazil and Australia

“…In Australia, the disease was first observed in the late 18th century (Gregory, ). Anthracnose symptoms appear from budburst until the end of the crop cycle, infecting all aboveground parts of the grapevine, and being more severe on younger tissues (Barros, Biasi, Carisse, & May De Mio, ). Infected leaves, petioles, stems, tendrils, rachises and berries show small, reddish and circular spots that enlarge to become brownish and sunken lesions with a grey or dark centre (Thind, ).…”

“…Grape species such as Vitis labrusca, V. vinifera, V. rotundifolia, V. riparia and Vitis sp. (hybrids) are susceptible to anthracnose (Barros et al, 2015;Kono, Sato, Ban, & Mitani, 2013;Louime et al, 2011;Yun, Louime, & Lu, 2007). Generally, table grape cultivars are more susceptible to anthracnose than wine grape cultivars (Hart, Magarey, Emmett, & Magarey, 1993;Kono et al, 2013).…”

Cycle, physicochemical characterization and climatic adaptation of a white hybrid grape on different rootstocks

“…The interaction between rootstock and canopy is fundamental for the most important V. vinifera cultivars, such as Cabernet Sauvignon and Merlot, but it is less pronounced for interspecific hybrids because these materials are rustic (Barros et al 2015;Phillips et al 2015). Most cultivated hybrids are usually from crosses with North American species of Vitis, which provide better homogeneity when these varieties are grafted onto many rootstocks from the same region (Corso et al 2015;Nimbolkar et al 2016;Bascuñán-Godoy et al 2017).…”