Powdery mildew (pea) [Erysiphe pisi]
Infected leaves, stalk and pods are covered by a dense white coat (Picture 1) that can later turn gray to black (Picture 2). The infected sites on the pods become sunken. Vegetative growth decreases. The decreased vegetative growth negatively impacts the harvest yield. Peas from infected pods are not marketable.
The fungus usually appears shortly before harvest and in late sown crops. It over-winters on infected pea debris from the previous year, this is the primary source of infection.
Remove infected plant debris and follow a crop rotation. Some pea species are resistant. Early cultivation is recommended. Fungicide treatment should be performed at the beginning of infection.