Damping-off

Disease Information

Damping-off 

Pythium spp. Rhizoctonia spp.

SYMPTOMS

Failure of seedling to emerge; light brown, seedlings with light brown to redwater-soaked roots and stems; collapse of plants; plant dry up and die; stunted plant growth; rotting taproot with few lateral roots

COMMENTS on disease

Disease favors warm weather and very wet soil with poor drainage

MANAGEMENT

Plant pathogen-free seed or transplants that have been produced in sterilized soil; apply fungicide to seed to kill off any fungi; shallow plant seeds or delay planting until soil warms

Non-chemical Pest Management in Eggplant

There are 3 causal agents of damping-off, namely: Pythium spp., Rhizoctonia solani, Fusarium Pythium spp.
The symptoms include dark-brown to black watersoaked lesions that rapidly spread over the entire seedling causing the seedling to wilt and die.

Rhizoctonia solani The symptoms include reddish-brown lesions on stem and death of growing tips. The lesions are also found on roots and stem near the soil line that cause the seedlings to wilt and eventually die.
Fusarium species The symptoms include dark-brown lesions on the stem and dark-brown lesions on roots and stems at or near the crown, killing the seedlings. The root lesion is soft and water-soaked.
Conditions that favor development
1. High soil moisture and/or compaction
2. Overcrowding
3. Poor ventilation
4. Cool, damp, cloudy weather.
5. Water-splashing moves infested soil from
diseased to healthy plants.
Preventive control
1. Improve the drainage and regulate soil moisture to prevent soil saturation.
2. Seed treatment.
3. Rotation to cereal crops .
4. Soil fumigation or solarization may reduce damping-off in the field.
5. Use pasteurized soil mixes in nurseries

 



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