<p>The most common grape disease in Uzbekistan is mildew. The article shows the effectiveness of the new fungicide Banjo Forte 40% k.s. against mildew of grapes. It provides data on high biological effectiveness of the drug when used in grape plantations. The research was conducted in Samarkand region in 2017–2018 with the aim of testing and comparing the effectiveness of the drug against grape mildew. According to the research findings, when using Banjo Forte 40% c.p. at a consumption rate of 0.8-1.0 l / ha, the biological efficiency on the leaves reached 89.4 91.5%, while on fruits 95.4-97.1%. When mixed with water, the preparative blend quickly forms the working liquid, and phytotoxicity of the drug has not been identified in the indicated consumption rates. The study results showed that this drug is more effective compared to the reference drug Acrobat MC 690 g / kg, v.d.g. Keywords: viticulture, agriculture, mildew, plant damage, fungicide, biological effectiveness</p>