Abstract
The genetics of quantitative resistance to powdery mildew (Erysiphe graminis f. sp. secalis) in winter rye (Secale cereale) was investigated by testing four sets of factorial crosses along with their parental inbred lines (53 crosses, 28 inbred lines in total) at two locations during 1988 and 1989. Genotypes were scored on a 0-9 scale for the percentage of infected leaf area at booting and heading stages on the upper three leaves of 10 randomly chosen main stems per plot. Estimates of heritability were high in all materials at both assessment stages (h 2 =0.65-0.95). High correlations were found among leaves (r=0.75-0.97; P=0.01) for all sets and between booting and heading pooled over leaves for three out of four sets (r=0.89-0.98; P=0.01) [...]
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