Timorex 24EC is a commercial, natural fungicide containing 23.8% of oil extracted from tea tree [Melaleuca alternifolia (Maiden & Betche) Cheel], registered in more than 30 countries around the world, including Poland, to control some fungal diseases of vegetables grown in conventional and organic systems. The aim of this preliminary work was to establish concentrations of this product applied as seed dressing, at which it would be effective in reducing fungal contaminations of winter wheat seeds. Results of this study indicate that 1:10 water dilution of Timorex Gold 24 EC can be recommended as a seed dressing at the rates of 1-2 ml/100g of seed as at this rate it effectively inhibited development of fungi contaminating winter wheat seeds and did not show any adverse effects on seed germination.