EVALUATION OF FOLIAR RESISTANCE TO UNCINULA NECATOR IN CHINESE WILD VITIS SPECIES

Resistance to grape powdery mildew (Uncinula necator BURR.) of 13 know n Vitis species and 5 unclassified grapes native to China was evaluate d. 88 clones were tested with natural infection and a subset of 34 wer e artificially inoculated during the years of 1991-1992. 68 clones sho wed resistance to U. necator. In general, we found clones of V. bryoni ifolia, V. davidii, and IS piasezkii resistant to U. necator. However, intraspecific variations were observed. Results from this study indic ate that Chinese native wild grapes may provide valuable germplasm res ources for powdery mildew resistance.