Bewertung von Zuchtstämmen und Sippen der Sommergerste auf partielle Resistenz gegen Mehltau auf dem Feld

Identification of new sources for resistance to powdery mildew in H. spontaneum-derived winter barley lines

“…This effect seemed to be dependent on inoculum density, but also characterized certain line-isolate combinations. The favourable influence of lower infection density on the appearance of intermediate reactions has been reported also by other authors (Aust and Kranz, 1974;Hartleb et al, 1987;E1-Hennaway, 1988;Weber, 1986;Lachenmaier, 1989), and has been often ascribed to a heterogenous distribution of mildew conidia over the infected leaf area. Specific line-isolate effects (Lachenmaier, 1989) have been attributed to a reduced number of pustels cm -2 when lower infection densities were applied in studies on quantitative mildew resistance of winter barley cultivars.…”