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Ramularia leaf spot (RLS), caused by the fungus <i>Ramularia collo-cygni</i>, has recently become widespread in Europe. Succinate dehydrogenase inhibitor (SDHI) and demethylation inhibitor (DMI) fungicides are mainly applied for disease control on barley fields, but pathogen isolates with a reduced sensitivity can cause difficulties. There is an urgent need for new spring barley cultivars that are more resistant to RLS development and can inhibit <i>R. collo-cygni</i> epidemics.