Cucumber vines and squash have mildew on leaves. How do I treat with many cucumbers on vines?
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This is a common issue for cucurbits such as these. Since they are so sensitive to it, though, it will be a little trickier to cure on these types of plants.
This article will give you a good rundown: https://www.gardeningknowhow.com/edible/vegetables/squash/powdery-mildew-in-squash.htm