Infected plants show water-soaked lesions on the leaves. On stems and petioles, brown to black and sunken-in lesions appear. Above the stems lesions the plant starts to wilt and can finally die. An infection of young seedlings leads to damping off (sudden death). If the plant does not die, large galls develop on the stem.
Phytophthora Blight is a soil-borne fungus. It overwinters in plant debris. Humid conditions like drizzling rain and temperatures around 25°C favour an infection. Leaf wetness of 8h is required for an infection. Pigeon Peas develop a resistance to the disease after some time.
The infection risk can be reduced by applying potassium fertilizer.
You can treat your seeds with 4 g metalaxyl per kg of seeds to prevent Phytophthora Blight.