Submitted by deepalitewari on Fri, 03/07/2009 - 13:02
Posted in
Powdery mildew of vegetable pea
Causal Organism: Erysiphe cichoracearum DC.
- Outbreak of this disease is associated with dry weather.
- The disease affects the crop between February to April.
- The disease develops late in season and reaches to maximum intensity at the time of pod formation.
- The early cultivars escape the disease.
Symptoms:
- It attacks leaves first producing faint, slightly discolourd specks from which grayish white powdery growth of mycelium and spores spread over leaf, stem and pod.
- The leaves turn yellow and die.
- The fruits do not either set or remain very small.
- It causes defoliation.
- Later stages, powdery growth also covers the pod making them unsuitable for marketing.
Control:
- Avoid late planting.
- After harvest, collect the plants left in the field and burn them.
- By formulation of wettable Sulphur such as Sulfex and Thiovit at 3 kg/ha
- Elosal 8 WP three time at 10 days interval
- Karathane (Dinocap- 0.05%), Dikar (Manocap), Mososide (Binapacryl) and Morestan (Quinomethionate)
- 0.03 % Calixin followed by Karathane (0.2%) and Bavistin (100 ppm)
- Grow resistant varieties like JP-83, PSM-5, JP-4, JRS-14 and Arka Ajit.
- There is need to develop cultivars resistant to powdery mildew because the disease is of common occurance. Some of them are P 185, and 6578 (immune to E. polygony), EC33866 as moderately resistant with 25% leaves infecting.
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