Diseases
Downy Mildew of Grapevine
Vitis vinifera L. subsp. vinifera
A fungal disease caused by the oomycete Plasmopara viticola, which affects all green organs of Vitis vinifera. The species is characterized by a lack of inherent genetic resistance, to overcome which Rpv loci introduced from wild grape species are used.
In the reference 3 varieties crop Wine grape, where this is mentioned in the description.
The pathogen is an obligate biotrophic organism, Plasmopara viticola, which infects leaves, shoots, tendrils, inflorescences, and young berries. On young leaves, the disease manifests as oily spots with a whitish sporulation coating under high humidity, while on older leaves, it appears as a mosaic pattern. Infection of inflorescences and berries leads to browning, desiccation, and shedding, while shoot infection causes necrosis.
Cultivated grapevine Vitis vinifera possesses virtually no natural resistance to the pathogen. In modern breeding, resistance genes Rpv, obtained through interspecific hybridization with North American and Asian species, are introduced for protection. The presence of these loci, such as Rpv3 or Rpv28.2, is confirmed in breeding material using specific DNA markers.
General information about the subject — on the page Downy mildew of grapevines.
Varieties of Wine grape mentioned in the description
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