EN
The economic importance of Spironucleus diseases led the authors to study the effect of aqueous and ethanol plant extracts on the growth of S. vortens. In the present study 0.025 g L⁻¹, 0.05 g L⁻¹ and 0.10 g L⁻¹ (w/v) aquatic and ethanol extracts of tetterwort (Chelidonium majus), purple coneflower (Echinacea purpurea), garlic (Allium sativum), chestnut (Aesculus hippocastanum), horseradish (Armoracia rusticana), Bryophyllum pinnatum (Kolanchoe pinnata), oregano (Origanum vulgare), tansy (Tanacetum vulgare), thyme (Thymus vulgaris), and yarrow (Achillea millefolium) were tested against in vitro growth of Spironucleus vortens isolated from the digestive tract of discus (Symphysodon discus). The extracts of chestnut, garlic, horseradish, oregano and tansy were found to be the most effective. The 0.10 g L⁻¹ extracts of these plants attained a high level of over 90% parasite growth inhibition, while their 0.025 g L⁻¹ extracts, with the exception of the oregano, attained 60% parasite growth inhibition. The results of the study confirmed that natural products are potential sources of new agents for the treatment and control of spironucleosis.