Managing Powdery Mildew of Cherry in Washington Orchards and Nurseries with Spray Oils

Fig. 1. Foliar symptoms of powdery mildew of sweet cherry, caused by Podosphaera clandestina. Foliar mildew colonies serve as an inoculum source for fruit infections that can occur during fruit development.



Image from Plant Health Progress article:
Managing Powdery Mildew of Cherry in Washington Orchards and Nurseries with Spray Oils