TNAU Agritech Portal
Home | About Us | Success Stories | Farmers Association | Farmers' Innovation | Publications| Contact

Agricultural crops :: Cereals :: Rice

Bacterial Leaf Streak :Causal organism: Xanthomonas oryzae pv. oryzicola

Symptoms:

  • Fine translucent streaks are formed on the veins and the lesions enlarge lengthwise and infect larger veins and turn brown
  • On the surface of the lesions, bacterial ooze comes out and form form small yellow band-like exudates under humid conditions.
  • In severe cases the leaves dry up.


 
  SYMPTOMS
Pathogen Character:
  • The bacterium is aerobic, gram negative, non spore forming,
    rod with size ranging from 1-2 x 0.8-1.0􀀀m with monotrichous polar flagellum..
  • 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:

  • IRRI, Phillippines

 

Home | About Us | Success Stories | Farmers Association | Publications | Disclaimer | Contact Us

© TNAU 2008 - 2024 All Rights Reserved.