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3 grape bushes of 12 are covered with some gray muck, the brushes have not matured, how to deal with it?
Good little, most likely, you are observing a defeat of powdery mildew (Oidium, Mildew). It’s difficult to determine exactly without a photo. These fungal diseases are often activated in high humidity, when in summer the temperature does not rise above 24 degrees Celsius. Torrential rains contribute to the rapid spread of fungus. If the fungus has captured a large area without spraying with fungicides, you can not do: Delan, Hom, Abiga peak. Spraying with a mixture of Bordeaux liquid with colloidal sulfur is also effective.