DETECTION OF TOLERANCE OF BARLEY CULTIVARS TO INFECTION BY POWDERY MILDEW (ERYSIPHE-GRAMINIS F SP HORDEI)

Barley genotypes representing a wide range of resistance expressions a nd origins, from major resistance genes in modern cultivars to field r esistances in landraces, were assessed for tolerance to disease under glasshouse and field conditions. A few genotypes were picked out as sh owing less yield loss than would be expected from the level of mildew infection. Genotypes showing more than the expected yield loss were al so found. The potential use of tolerance as a breeding character is di scussed.