Excessive Moisture and Humidity. Control. Mildew on peas is a sign the plants have exhausted their fertiliser. If the mildew is just beginning and only starting to affect the outside of the pods, check the peas inside the pods and if they are unaffected, harvest all the peas and freeze any excess. What to look for. Powdery mildew can be a very important disease when conditions are favorable. Producers of field peas may need to scout for powdery mildew this year. Biology. Late planted peas are at greater risk for yield loss than early planted peas. Powdery mildew is a late-season fungal disease that can impact peas if weather conditions are conducive. As severe infections defoliate beans, yield reduction is reduced. The pods that do form develop purplish spotting and become distorted, thus unsalable. Powdery mildew thrives in environments with consistent humidity higher than 70-85 percent. Field Pea Diseases Review: Powdery Mildew: Importance. It occurs sporadically when warm humid conditions favour its growth late in the season. Powdery mildew of southern peas is most common on older leaves and stems. Powdery mildew thrives in environments with consistent temperatures between 62 and 72°F (16.7 to 22°C). In India, the disease generally appears during November-December. Spring conditions were cooler and wetter than typical for the area. Powdery mildew overwinters on plant debris. Causal Organism of Downy Mildew of Pea 3. When the disease is severe, the peas are stunted, turn yellow, and defoliate. Powdery mildew on peas Following photographs taken 5 July 2017 are snap peas that became very severely affected, with powdery mildew developing on pods and causing black discoloration. It develops more severely on the lower leaves but it can infect any of the leaves in cool, humid weather. Powdery mildew can be a serious disease of field peas grown in Victoria. Disease Cycle 4. It appears as cottony-white to tan fungal colonies and yellowed blotches on the upper and lower surfaces of the leaves. However, this disease can also occur in early planted fields in South Dakota under the right environmental conditions and when the crop canopy is heavy. Seed from infected pods can be discoloured and less palatable, which reduces its market value. So you will want your vegetables to have access to a good heat and light source during autumn, or whenever this temperature range is typical. ADVERTISEMENTS: Physiologic races of the fungus attack beans, urd, lucerne, coriander, turnip, cabbage and many other plants. The powdery mildew of peas is worldwide in occurrence causing serious losses to the crop. The talc-like powdery mildew is made up of spores that are blown by the wind to infect nearby plants. Symptoms of Downy Mildew of Pea: Yellow to brown scattered patches of discoloured areas appear on the upper surface of the leaflets and stipules. Field peas. 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