• This diseases causes seed rotting, pre-emergence damping off. The disease appears in circular patches in the field here and there.
• All the affected plants get killed. if the disease occurs prior to seed germination, it causes gappiness.
• The seeds or seed materials are killed before their establishment.
• The disease also occurs after establishment of the crop i.e after 15 to 30 days of sowing or planting. This stage is called post-emergence damping off.
• If the disease occurs very late, it causes stunting of the plant and rotting of the roots.

• The disease is caused by complex of Pythium aphanidermatum, P. debaryanum and P. ultimum

• Seed treatment with Thiram or Captan @ 4g/kg. The bulbs may be dipped in Thiram solution 0.25%.
• After sprouting, the root region of the plants along the rows should be given a soil drenching with Copper oxychloride 0.25%.

Source: