Diagnosis Disease Peonies

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stlgasman Chesterfield, MO Aug 09, 2021

I sprayed for fungus twice.

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AAgeorge Severna Park, MD Aug 22, 2021

Peonies are quite susceptible to powdery mildew. Be sure to toss all foliage at end of season.

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FirstNations Sumas, WA(Zone 6a) Sep 25, 2021

That is powdery mildew. It can't be prevented but it can be stopped in it's tracks if, at the first sight of a white haze, you spray the leaves with a castille soap solution.

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