Vegetable Pathologist at Clemson University Coastal Research & Education Center, has informed us that powdery mildew was found this week on seedless watermelon at the Coastal Research and Education Center in Charleston, SC. Symptoms of yellow and brown spots looked similar to those in Fig. 1. White mildew growth and short chains of clear powdery mildew spores were visible on the leaf underside.
Source: Powdery mildew on watermelon found in South Carolina | North Carolina Cooperative Extension
