Powdery mildew on peonies

Is mid July to late to spray. Most of the leaves are half covered already. I tried earlier in early June with no results.
Also, what should I do this fall when I cut them back.
Thanks

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1 Comment To "Powdery mildew on peonies"

#1 Comment By Downtoearthdigs On 07/18/2017 @ 11:02 pm

You can treat the plants every 10 to 14 days through the summer months.

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