Tomato Diseases
Early Blight
Symptoms
- Brown spots with concentric rings in a bull’s eye pattern with yellow margin.
- Fruit gets infected through calyx or stem attachment.
- Brown concentric rings on fruits.
Identification
- Causal organism: Alternaria solani
- Mycelium: coloured and septate
- Pathogen: coloured, beaked conidia with transverse and longitudinal septae, borne singly or in chains.
- Survival and Mode of Spread:
> Survival: Infected plant debris
> Primary spread: Infected seed
> Secondary spread: Conidia carried through rain, wind borne
- Favourable conditions: Warm, humid (24-29 degree C), rainy and wet weather.
Management
- Removal and destruction of crop debris.
- Crop rotation.
- Seed treatment: Trichoderma asperellum @ 4g/kg seeds
|
Fungicide |
Dosage |
|---|---|
|
  200 ml/acre |
|
|
  200 ml/acre |
|
|
1 kg/acre |
|
|
 Metiram 55% + Pyraclostrobin5% WG |
 600 g/acre |
|
200 ml/acre |
