Cercospora leaf spot, rust, and other fungal and bacterial plant diseases are the most common causes of hydrangea leaf spots ... You may need to repeat this treatment several times at 7 to ...

Hydrangeas (Hydrangea spp ... Unfortunately, there really aren't any effective treatments or preventatives for this bacterial leaf spot. Copper fungicides may provide limited protection when ...

Here treatment of our two native species differ ... Native shrubs are typically less vulnerable to common hydrangea diseases such as Botrytis Blight, Cercospora Leaf Spot, and Powdery Mildew. Of these ...