Evaluation of resistance to grapevine powdery mildew (Uncinula necator [Schw.] Burr., anamorph Oidium tuckeri Berk.) in accessions of Vitis species
Journal: Federal Research Centre for Cultivated Plants (Julius Kühn-Institut)
Year: 2015

119 accessions, including species from America and Asia, various hybrids and breeding stocks, were tested for resistance to powdery mildew (Uncinula necator) by a leaf disc test. Vitis candicans, V. munsoniana, V. piasezkii and V. rotundifolia were found to be resistant with a rating of up to 1.4 in all accessions (1-no infection, 9-very strong infection). V. munsoniana and V. rotundifolia showed extremely high resistance and may be excellent material for breeding programs. However, the accessio