Resistance to powdery mildew in black currant samples in Northwestern Russia

Abstract

The paper presents the results of evaluation of 273 samples of black currant to powdery mildew in Northwestern Russia. Epiphytoties of the diseases during the years of investigation made it possible to evaluate objectively said trait in the studied samples. The high level of field resistance to powdery mildew is shown by the varieties of scandinavian ecotype of Ribes nigrum L. The cultivars Avgustinka, Binar, Bolero, Druzhba at alias being derived with using of this taxon are characterized by high resistance to disease as well. The connection of plant’s resistance with content of separate components of phenolic compounds is revealed. The differences on the level of accumulation of flavonols in the leaves of resistant and susceptible varieties in the dynamics are discovered. The differences on quantitative content of flavonols and lipophilic pigments in leaves of various tiers in susceptible varieties are noted.