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Blast management in organic basmati rice

Rice blast

Causal organism: Pyricularia oryzae (magnaporthe grisa)

  • It infects plants at any stage of growth and stunts the plants.
  • It reduces the number of mature panicle, weight of individual grains and the weight and quality of rice.
  • High humidity favours development of lesions.
  • Disease is more destructive in areas with more rainfall.
  • Close planting or heavy application of nitrogenous fertilizer favours the disease.
  • Plants with high silica content are less infected by blast.



  • Typical leaf spots which are elliptical and somewhat pointed at both ends.
  • Spots begin as small, water-soaked, whitish, grayish or bluish dots on susceptible varieties.
  • Infection may occur in any part of the panicle, producing brown lesions.
  • It occurs near the panicle base, causing 'rotten neck' or 'neck rot' symptoms.


  • Burn affected straw and stubbles.
  • Grow tolerant varieties like IR-8, Jaya, Vandana, Hira, Savitri, Ratna, IR-36, and Annada.
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