Ascochyta blight: Ascochyta rabiei
| Symptom | |
| All plant parts are affected. Symptoms appear on leaves as water soaked lesions. Symptoms include smaller circular brown spots on leaves. Under favorable conditions, these spots enlarge rapidly and coalesce, blighting the leaves and buds. In case of severe infection, the entire plant dries up suddenly. The lesions are also developed on stems and petioles. Late infections result in shriveled and infected seed. The disease is seed borne in nature. Left over debris in the fields serve as a source. Wet and warm weather, and dense crop canopy are conducive to the spread of the disease Management Sow disease-free seed. Follow rotation crop. Intercrop with wheat, barley, mustard Seed treatment with Carbendazim @ 1g/kg of seed. or Hot water seed treatment (52 C for 10 min) to lower the infestation. Spray the crop with Mancozeb @ 2.5g/lit if noticed during the growth period. or Spray Wettable sulphur at the rate of 2.3g/lit of water. |
- All plant parts are affected.
- Symptoms appear on leaves as water soaked lesions.
- Symptoms include smaller circular brown spots on leaves.
- Under favorable conditions, these spots enlarge rapidly and coalesce, blighting the leaves and buds.
- In case of severe infection, the entire plant dries up suddenly.
- The lesions are also developed on stems and petioles.
- Late infections result in shriveled and infected seed.
- The disease is seed borne in nature.
- Left over debris in the fields serve as a source.
- Wet and warm weather, and dense crop canopy are conducive to the spread of the disease
Management
- Sow disease-free seed.
- Follow rotation crop.
- Intercrop with wheat, barley, mustard
- Seed treatment with Carbendazim @ 1g/kg of seed. or Hot water seed treatment (52 C for 10 min) to lower the infestation.
- Spray the crop with Mancozeb @ 2.5g/lit if noticed during the growth period. or Spray Wettable sulphur at the rate of 2.3g/lit of water.