Onion White Rot

Onion White Rot: Sclerotium cepivorum

Symptom:
  • The leaves become yellow and die-back and when the plants are pulled up, roots are found to be rotten and the base of the bulb covered with a white or grey fungal growth.
  • Later, numerous small black spherical sclerotia are produced. The bulb of the onion completely rots.
Management
  • Crop rotation and clean seed are the only effective control.
  • Heavy manuring with organic manures reduces the disease in the crop. Seed dressing with Benomyl, Carbendazim or Thiophanate-methyl (100 to 150 g/kg seed) gives effective control.

 

Source-

  • TamilNadu Agritech Portal
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