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Zinnias and powdery mildew

ladybug80
13 years ago

Hello Everyone,

I planted some small white single petal zinnias this late spring, and after a couple of weeks the leaves began to turn gray and spotty. I think it is the powdery mildew that I found out is common with zinnias.

First of all, should I treat them or pull them out to prevent spreading to other plants?

Second, if I should treat them, what is the best way? What is the treatment that works well for most?

Thank you!

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