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I assume this is the powdery mildew but what can I do for it??

Here is last year's bloom

Oh, what a shame...but I found this for you on Gardeningknowhow.com:

"Treating Peony Powdery Mildew

Once powdery mildew appears, it can be difficult to treat, depending on the type and how severe the problem. For this reason, prevention is important. Avoiding susceptible cultivars, locating plants in full sun, providing suitable air circulation, and practicing proper maintenance (i.e. water, fertilizer, etc.) is usually adequate. Watering in the morning hours may also help.

But even with the best of precautions taken, powdery mildew may still strike. Although fungicides can help when applied early on, heavier infections may need to be treated with horticultural oil or neem oil. You can also use a homemade solution—mixing together a tablespoon each of baking soda, horticultural oil (or canola), and liquid dish soap (without bleach) with a gallon of water. Spray on your peonies every 10-14 days throughout the summer months. Do not spray the solution during hot and sunny days."

This message has been edited. Last edited by: mgt,

Ditto what Mgt said & water at the base of the plant might help. Don't dig it up as it may sprout next Spring. I think I experienced something like that once & a whole season later...here it comes out of the ground!