What causes white spots on cucumber plants
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https://therustedgarden.blogspot.com/2013/07/treatment-for-white-spots-or-powdery.html
Diseases. Cucumber plants often suffer from powdery mildew disease. Caused by the Sphaerotheca fuliginea and the Erysiphe cichoracearum fungi, powdery mildew appears as white, powdery spots on the leaves.
Remove all the infected plant parts and destroy them. Remember, do not compost any infected plant, as the disease can still be spread by the wind. Spray infectedplants with fungicides. Effective fungicides for powdery mildew treatments or cures include sulfur, lime-sulfur, neem oil, and potassium bicarbonate.