Black Gram Root Rot and Leaf Blight: Rhizoctonia solani
The pathogens cause seed decay, root rot, damping-off, seedling blight, stem canker and leaf blight in Green Gram.
The disease occurs commonly at the podding stage.
In the initial stages, the fungus causes seed rot, seedling blight and root rot symptoms.
The affected leaves turn yellow in colour and brown irregular lesions appear on leaves.
On coalescence of such lesions, big blotches are formed and the affected leaves start drying prematurely.
Roots and basal portion of the stem become black in colour and the bark peels off easily.
The affected plants dry up gradually. When the tap root of the affected plant is split open, reddening of internal tissues is visible. The pathogen is soil-borne.
- Seed treatment with Trichoderma viride 4 g/kg or Pseudomonas fluorescens 10 g/kg
- Basal application of zinc sulphate 25 kg/ha
- Basal application of neem cake @ 150 kg/ha
- Soil application P. fluorescens or T. viride – 2.5 kg/ha + 50 kg of well decomposed FYM or sand at 30 days after sowing.
- Spot drenching of Carbendazim @ 1 gm/ lit.
- TamilNadu Agritech Portal