Try Lee Reich's simple recipe for powdery mildew control in grapes or gooseberries. Spray plants with the following:
4 litres (1 gallon) of water
1 tablespoon sodium bicarbonate (baking soda)
1 tablespoon canola oil
Repeated applications may be needed, especially in rainy weather.

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michael rossy (verified owner) –
Anonymous (verified owner) –
Hasn't leaf out yet , but grapes can be slow
Denis Carrier (verified owner) –
Myrna B. (verified owner) –