Powdery mildew on plants—a white fuzz or powder that usually appears on leaves and sometimes on the stem, flowers, or fruit—is a common ailment. "The upper leaf surfaces will have a powdery ...

a group of parasitic fungi causing the diseases known as white mildew, powdery mildew, blight, Mehlthau, blanc, &c. In their conidial or “oidium” stage they are common throughout the summer on ...

Downy mildew of lima bean ... rarely does it infect leaves. The pathogen prefers young, actively expanding tissue. The pathogen appears as a dense, cottony white mat on pods and racemes (Figure 1).