The seeds should be treated with recommended fungicide before sowing.
The continuous raising of the nursery in the same plot should be avoided.
The topsoil of the nursery should be treated with Carbendazim @ 5 gm/square m. area of the soil and the nursery should be drenched with Carbendazim @ 2gm/litre of water fortnightly.
Soil solarization by spreading 250 gauge polythene sheet over the bed for 30 days before sowing in summer season should be done.
Application of bio-control agent Trichoderma viride in soil @ 500 gram/acre is also found effective to control damping-off to a considerable extent.