Identifying and Treating Septoria Leaf Spot on Dogwood

Small Brown Spots on Variegated Red Twig Dogwood

Newly planted dogwoods developing small brown spots across leaves likely have Septoria leaf spot, a common fungal disease. The problem appeared two months after spring planting.

Management Steps

1. Confirm diagnosis using resources from Iowa State and University of Georgia extensions.
2. Remove affected leaves and dispose of them (do not compost).
3. Improve air circulation by pruning nearby growth.
4. Apply fungicide labeled for Septoria on ornamental shrubs if infection is severe.
5. Avoid overhead watering to keep foliage dry.

Helpful Resources

• Iowa State: Septoria Leaf Spot
• UGA Extension: Septoria on Woody Ornamentals