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Hydrangea Leaf Spot (Cercospora): Causes and Fungicide Treatment

Q: My year-old hydrangeas have round brown leaf spots and no blooms.

Cercospora leaf spot—common when leaves stay wet from rain/irrigation or dense growth prevents drying. Spray landscape fungicide (click for sources) at first sign.

See Hydrangea Diseases – Auburn.

About Gardening: Indian Hawthorn Leaf Spot and Chlorosis: Dual Diagnosis and Treatment; Entomosporium Leaf Spot on Photinia and Indian Hawthorn; Brown Spot on Phalaenopsis Leaf: Bacterial Infection Emergency Response; Black Spot Fungus Spreading: Climber as Disease Reservoir; Hydrangea Varieties and Care: From Planting to Pruning and Drying Blooms; When to Prune Hydrangeas: Complete Guide by Variety; Growing Hydrangeas: Complete Guide to Varieties, Care & Pruning; Winter Care for Common Hydrangeas in Atlanta: When to Cover and Which Varieties Rebloom; Cleyera Decline: Shade and Pruning Invite Leaf Spot; Managing Iris Leaf Spot: Identification and Control

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