Investigations were carried out in 1996-1998 in the experimental fields in Zamość region. The following ten lines of oats were tested: CHD 894, CHD 1095, CHD 1236, CHD 1607, CHD 1653, CHD 1692, STH 2293, STH 2393, STH 2494, STH 2694. The seedlings which showed symptoms of either root and sheath nectosis, or rolling stems ranged form 9 - 36 ad 9 - 70 % of all seedlings tested, respectively. Results of mycological analysis of seedlings showed that F. avenaceum and F. culmorum were most frequently represented on infected parts (43% ad 42% of all Flusarium spp. isolates respectively), and also they were the most frequently obtained trom stems wit h necrotic stripes (24 % and 46 % of all Fusarium spp., respectively). Apart from F. avenaceum and F. culmorum there was some F. crookwellense found every year on lower internodes.
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