I have a peony with brown spots on the leaves- I'm hoping someone can help me diagnose this issue and suggest some assistance. There are no white deposits or fuzzy spores. The spots are a medium to light brown color- and are generally about 1-2 inches each in length.

It has been extremely wet here and the wet was followed with several days of very high heat.

Is there a product that I might purchase to treat this? Is there any way to control spread without cutting the peony back?

Thanks!