Downy mildew of peas (Pisum sativum) is caused by Peronospora viciae, which also infects broad beans.Downy mildew is regarded as the most common foliar disease of peas and is a major problem in the UK, particularly in the east. Late-drilled peas are the worst affected.

Downy Mildew Symptoms in Spring Beans & Peas

Yellowish blotches appear on the leaves, with a pale mauve or brown mould on the underside. Infected pods are spotted and distorted.

Downy mildew is more likely to appear when temperatures are below 10°C, & when crops have been wet for more than 12 hours.

Downy Mildew Control in Spring Beans

• Crop rotation reduces the possibility of downy mildew
• Plants affected with downy mildew should be burnt after picking the crop
• Sprays are available to control downy mildew. Although the disease may be present when the crop is in flower, no benefit will accrue from spraying at this time. Always follow the manufacturer’s instructions on the spray container.