Diseases
Powdery mildew in Vitis berlandieri Planch x Vitis rupestris Scheele
Vitis berlandieri Planch x Vitis rupestris Scheele
The disease caused by the fungus Erysiphe necator manifests in Vitis berlandieri x Vitis rupestris hybrids as specific necrotic spots and tissue discoloration, which distinguishes their reaction from that of susceptible Vitis vinifera cultivars.
In the reference 4 varieties crop Vitis berlandieri Planch x Vitis rupestris Scheele, where this is mentioned in the description.
The powdery mildew pathogen Erysiphe necator, upon contact with the tissues of this rootstock hybrid, triggers a defense response manifested as necrotic spots. Symptoms are primarily detected on the underside of the leaf blade approximately one week after infection and are accompanied by localized tissue discoloration.
Unlike cultivated grape varieties, these hybrids possess defense mechanisms formed during co-evolution with North American pathogens. Resistance to powdery mildew in these species is polygenic, and their genome is used by breeders as a source of resistance loci for the development of new cultivars.
General information about the subject — on the page Powdery mildew.
Varieties of Vitis berlandieri Planch x Vitis rupestris Scheele mentioned in the description
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