Pigeon Pea & Red Gram
Phytophthora drechsleri f. sp. cajani
An infection of young seedlings leads to damping off (sudden death). If the plant does not die, large galls develop on the stem. Infected plants show water-soaked lesions on the leaves. On stems and petioles, brown to black and sunken-in lesions appear. Above the stem lesions the plant starts to wilt and might eventually die.
The symptoms are caused by the soil-borne fungus Phytophthora drechsleri. It overwinters in plant debris. Humid conditions like drizzling rain and temperatures around 25°C favor an infection. Leaf wetness of 8 hours is required for an infection. Pigeon peas develop a resistance to the disease after some time.
Pseudomonas fluorescens and Bacillus subtilis, as well as Trichoderma viride and hamatum are effective against stem rot.
Always consider an integrated approach, using both preventive measures together with biological treatments if available. You can treat your seeds with 4 g metalaxyl per kilogram of seeds to prevent Phytophthora Blight.