Common Crepe Myrtle Diseases: Powdery Mildew, Leaf Spot, Sooty Mold

Major Disease Threats to Crepe Myrtles

In the U.S., the most significant infectious diseases are Powdery Mildew and Cercospora leaf spot, both fungal and primarily attacking leaves. Sooty mold is a non-disease issue: black coating on leaves/stems caused by insect infestations (aphids, scales) that excrete honeydew.

Management Overview

• Choose resistant varieties.
• Improve air circulation.
• Control insects to prevent sooty mold.
• Apply fungicides if needed for mildew or leaf spot.