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South African
Wine Lab Association:

Determination of Downy Mildew and Powdery Mildew Resistance of some grape cultivars

A. Atak

Different grape cultivars of Vitis species have been cultivated in Turkey since ancient times. A large
proportion of these cultivars cannot be cultivated in the humid regions of the country due to downy mildew
(Plasmopara viticola) and powdery mildew (Uncinula necator or syn. Erysiphe necator) diseases. Cultivars
resistant to these diseases can generally grow without any or fewer fungicide applications. However, there
are also differences in the resistance level of cultivars. In particular, Vitis vinifera cultivars, the most
widely cultured species, are most affected by these diseases. Thirteen V. vinifera cultivars, eight V. labrusca
cultivars and six interspecific cultivars were used in this study, for a total of 27 cultivars. The resistance
of cultivars against downy mildew and powdery mildew was determined over two years with natural
infection and artificial inoculation applications. Generally, all cultivars showed more resistance to downy
mildew, while they also showed lower resistance to powdery mildew. The evaluation based on species
found V. vinifera to be the most sensitive. While interspecific cultivars were found to be most resistant to
downy mildew, V. labrusca cultivars were the most resistant to powdery mildew. Among cultivars of the
same species, however, differences in terms of resistance were observed. These differences can be used in
breeding studies in order to obtain new, disease-resistant cultivars, which may be grown commercially to
comply with good agricultural practices (GAP) or organic viticulture in the future.

Vitis spp., disease severity, resistance, inoculation, natural infection

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