Pathogen Character:
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The bacterium is aerobic, gram negative, non spore forming, rod with size ranging from 1-2 x 0.8-1.0m with monotrichous polar flagellum..
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Bacterial colonies are circular, convex with entire margins, whitish yellow to straw yellow colored and opaque.
Favourable conditions/Epidemiology:
- Clipping of tip of the seedling at the time of transplanting.
- Heavy rain, heavy dew, flooding, deep irrigation water.
- Severe wind and temperature of 25-30 °c
Mode of spread and survival: :
- It is transmitted through seeds and infected stubbles to the next planting season.
- The pathogen spreads through irrigation water and also through rain storms.
Management:
Cultural method :
- Burn the stubbles.
- Use optimum dose of fertilizers.
- Avoid clipping of tip of seedling at the time of transplanting.
- Avoid flooded conditions.
- Remove weed hosts periodically.
Chemical Method :
- Avoid clipping of leaf tips during transplantation.
- Spray Streptomycin sulphate and tetracycline combination 120g + Copper oxychloride 500 g/ha.
Source of information:
- AICRIP rice, TNAU, Coimbatore, Rice diseases- online resource, IRRI, Phillippines.
Acknowledgements:
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