EN
The study was aimed at evaluation of resistance of breeding lines of fibrous and oil flax to Fusarium wilt. The studies were conducted under provocation conditions in field experiments. According to the results of long term research the crossings that showed the highest resistance to Fusarium were selected. These were the following genotypes: Nike, Natasja, Viking, Laura, Orszanski 2 , Marina, Ariane, Lazurnyj, Mogilewskij, Orszanskij 3, Fany, Szokinski, Jubilejnyj 2 and Olinette. The selected Polish varieties and all tested breeding lines are characterized with multi-factor resistance, so called horizontal resistance. This resistance is closely correlated with soil and climate conditions prevailing in Poland.