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Phytophthora Blight

Phytophthora Blight

Phytophthora drechsleri


In a Nutshell

    Water-soaked lesions on leavesBrown to black sunken lesions on stems and petiolesSudden death of infected plants

Hosts: %1$s

· Pigeonpea


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.

Biological Control

The infection risk can be reduced by applying potassium fertilizer.

Chemical Control

You can treat your seeds with 4 g metalaxyl per kg of seeds to prevent Phytophthora Blight.

Preventive Measures

    Avoid water loggingSow plants on top of ridgesProvide good drainageApply crop rotation