Tomato Diseases
Damping Off
Symptoms
- Pre-emergence phase : Complete rotting of seedlings.
- Post-emergence phase: Infected tissues become soft and water soaked.
- Seedlings topple over or collapse.
Identification
- Causal organism: Pythium aphanidermatum (Edson) Fitzp.
- Mycelium: Non septate, hyaline
- Pathogen : Asexual - Zoospores bi-flagellated, thin walled, Resting spores - Oospore.
- Survival and Mode of Spread:
> Primary Survival: Soil, Seed, Water
> Secondary Spread: Infected debris
- Favourable Conditions:
> High humidity, high soil moisture, cloudiness and low temperatures below 24°C for few days.
> Crowded seedlings, dampness due to high rainfall, poor drainage and excess of soil solutes
Management
- Cultural
> Avoid stagnation of water.
> Use raised beds of 15 cm height.
- Biological
> Treat the seeds with Trichoderma asperellum @ 4 g/kg or Bacillus subtilis @ 10g/kg of seeds 24 hours before sowing.
> Soil application of Bacillus subtilis @ 2.5 kg/ha with 50 kg of FYM.
|
Fungicide |
Dosage |
|---|---|
|
Drench with Copper Oxychloride 50% WP |
2.5 g/lit or 4 lit/sq.m |
|
Treat with Metalaxyl-M 31.8% ES |
2 ml/kg of seeds 24 hours before sowing |
