Abstract
Within 1990–1993 strong or moderate‐strong occurrence of Pyrenophora avenae was recorded in Austria, Finland, Italy, Poland and Russia. Moderate or weak‐moderate incidence of the pathogen was recorded in the Czech Republic, Germany, Poland, Russia and Sweden, weak incidence in Finland, Italy and Poland. The highest resistance index was found in the majority of Illinois lines and a number of other oats. The quality of resistance is given by the sum of resistant and moderately resistant readings within this period. There is probably pathogenic specialization of the fungus and differences in aggressiveness exist among its populations. Oat lines such as IL86–1158, IL85–6467, IL86–4189, IL85–2069, IL86–6404 and IL86–5698 and other ones included into the EODN can be assumed to possess some Pyrenophora avenae resistance.
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