Natural ways how to heal the fungus black spot from Peony plants.
I want to used natural pesticides for the black spots on leaf. PNE plants.
I think you are referring to peony botrytis blight. This is caused by a fungus that overwinters in the soil. Here is a good picture and prevention/treatment approaches. http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/diseases/fungal-spots/botrytis-blight-of-peony.aspx
If this doesn't look like your issue, check out these pictures of other peony diseases. http://www.missouribotanicalgarden.org/Portals/0/Gardening/Gardening%20Help/Visual%20Guides/Peony%20Problems.pdf