Hydrangea Leaf Spots: Likely Cercospora Fungus

Hydrangea in western NC has had a recurring leaf issue for four years despite beautiful blooms. The previous expert's link was broken.

Common Culprit: Cercospora Leaf Spot

This fungal disease appears as ¼-inch chocolate-brown spots on leaves during summer. It's the primary infectious leaf disease on hydrangea aside from viral blotches.

Next Steps

Submit a clear photo of the spots for confirmation. If Cercospora, management includes:

• Removing and destroying fallen leaves.
• Improving air circulation.
• Avoiding overhead irrigation.
• Fungicide applications (chlorothalonil, mancozeb) if severe, starting in spring.

Expert insight provided by Steve.