Brown spots on my peony leaves?

I am getting molted brown spots on the leaves of my newly planted peonies. They were planted in May and I live in Pittsburgh, PA zone 5. Do I need to Seven them? They are on the eastern side of my house and so they get sun until mid afternoon

Brown spots on my peony leaves?
The most frequently occurring pests are botrytis blight and leaf blotch, both fungal diseases. Especially prevalent during wet springs, botrytis affects leaves, stems and flowers. Spots appear on leaves, stems soften and decay and flowers either rot or buds blacken and fail to open. Prompt removal of infected material and a thorough fall cleanup are essential for control.





Leaf blotch develops during warm, moist weather. Glossy, dark purple spots form on the upper surfaces of leaves. Again, removal of infected leaves and good fall cleanup are necessary for control. Avoid overhead irrigation.





Other fungal diseases include Phytophthora blight and Verticillium wilt. These are soil-borne fungi with no cure other than destroying infected plants. Do not replant in diseased soil.





Peonies really need a full sun location. The east side of your home may not provide sufficient light for peonies. Further, humidity promotes fungal growth. Northern and, to a lesser degree, eastern exposures tend to be more humid than a southern or western exposure. Consider moving your Peonies to prevent future infections. Cut back foliage in fall and burn or discard to prevent overwintering fungal spores.





Sevin is an insecticide and will not control a fungal infection. Fungicides are preventative and can not cure a fungal infection once your peonies show the signs of an infection.

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