Abstract—Aquatic oomycetous fungi often cause serious damage to fresh water fishes. Antifungal activity of acetone extracts of three fruticose lichens namely, Cladonia amaurocraea, Cladonia rangiferina and Usnea longissima were investigated against three pathogenic oomycete fungi which can cause serious saprolegniasis: Saprolegnia parasitica, Achlya bisexualis and Pythium sp.. Usnic acid was also examined for antifungal activity against the pathogenic fungi. The minimum inhibitory concentration of usnic acid and lichen extracts for the tested fungi Saprolegnia parasitica and Achlya bisexualis were 2 mg L-1, 200 mg L-1 respectively. The higher concentration was needed to inhibit mycelial growth of Pythium sp.. The result suggests that the potential of using usnic acid and lichen extracts for controlling the saprolegniasis.
Keywords—antifungal activity, lichen, Oomycota, saprolegniasis, usnic acid.
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