The study was conducted on 50 single-hyphe R. solani isolates from potato tubers and sprouts grown in different regions of Poland and town of Bilitt (Norway). PCR assay showed that 45 isolates had the expected amplification product which classified them into group AG 3. Five isolates, which did not reveal the presence of this product were tested with SCAR primer sets designed for identification of AG 2-1 and AG 2-2 groups. PCR assay showed one isolate belonging to the AG 2-1 group, but no amplification product was produced for group AG 2-2.
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