EN
In laboratory experiments were evaluated: wetability, pH and retention on beetroot leaves (green, with amaranth tone, with powdery mildew). Static surface tension of a spray liquids was also determinated. Experiments were conducted with two fungicides (Domark 100 EC – tetraconazole and Bravo Plus 500 SC – chlorothalonil) and two adjuvants Atpolan 80 EC and Break Thrue S 240. It was concluded that properties of leaf surface can significantly change spray liquid properties of agrochemicals on leaf lamina. Wetability and pH of spray liquid on beetroot leaves differed depending on colour of a leaf lamina and on powdery mildew fungus. pH of spray liquid on leaf lamina might influence efficacy of fungicides mixed with adjuvants used to beetroot protection against Cercospora leaf spot.