Black Gram Root Rot and Leaf Blight

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
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