The purpose of the research was to determine the biological effectiveness of the product based on liquid sulfur as a fungicide in the prevention and control of powdery mildew (Uncinula necator) in grapevines. The product based on liquid sulphur, which meets the requirements for organic farming, with doses between 3.0-4.0 l/ha, in the climatic conditions of 2024, has been shown to be 92% effective at the level of the chemical standard Kumulus DF in the prevention and control of powdery mildew (U. necator) in grapevines. The data obtained are preventive and research will continue.
