Diversity of fungal species on laid and stand-retted flax [Mikromicetų rūšių įvairovė ant klojėjamų paklotų ir nerautų linų]. – Botanica Lithuanica, 13(1): 51–59

In 2002–2004 fungal contamination of dew-retted flax, laid in swaths or left standing, was investigated. Meteorological conditions in separate years were very different and flax retting lasted from 9 to 13 weeks. In dry 2002 the least amount of fungal colony forming units (cfu) per 1 gram of flax stems was found, but species diversity was the highest. The lower numbers of fungal species but high level of contamination with colony forming units (cfu/g-1) were estimated under favourable air humidity and temperature conditions (in 2004). The contamination of stand-retted flax was significantly lower and variation of fungi number was lower than on laid flax. The complexes of 7–12 dominating fungal species were found on laid and of 5–7 species – on standing flax. Most isolated species belong to the Alternaria, Cladosporium, Fusarium and Penicillium genera. The portion of Cladosporium species – active participants of retting process – increased after 30–50 days from harvesting and reached 23–75 % on laid and 11–80 % on stand-retted flax.

Keywords: fungi, species diversity, flax, dew-retting.