I know everyone see’s this on their Hydrangeas at some point, so here is some good information on control. This disease rarely kills the plant, but it does affect flower budding. Remove diseased leaves and throw in trash. DO NOT LEAVE DISEASED LEAVES IN GARDEN. Spray regularly with Daconil fungicide. This will only stop spreading but not cure it.
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Clean Cut Landscape Co.
New Orleans and Metairie Landscape Plant Professionals