Evaluation of the resistance of Georgian grapevine germplasm towards powdery mildew (Erysiphe necator Schwein) under controlled conditions.
2024
Grape powdery mildew, caused by Erysiphe necator Schwein, poses a significant threat to widely cultivated Vitis vinifera L., leading to environmental and health concerns due to the prevalent use of fungicides. To address this, researchers are exploring the development of resistant grapevine varieties through crossbreeding with ther American Vitaceae. However, historical attempts resulted in hybrids with undesirable wine qualities inherited from American species. Georgian and European studies have revealed grape varieties relatively resistant to grape ash. Georgian germplasm includes 525 varieties of high genetic variability and is promising for the search of resistant genotypes. The aim of the present study is to study 80 varieties of vines distinguished by their field resistance using the OIV455 descriptor. Observations were made on the vines non treated by pesticides under greenhouse conditions. Different types of persistence were identified: some species were characterized by stable persistence (score 7-9), and others by unstable persistence (score 1-5, 1-7, 3-5, etc.). The present study is based on one year of data and confirms the need to continue the current research in order to better study the identified relatively resistant varieties. Fig. 1, Ref. 13.
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