Leaf Scald

Leaf Scald:Microdochium oryzae


  • Zonate lesions of alternating light tan and dark brown starting from leaf tips or edges
  • Lesions oblong with light brown halos in mature leaves
  • Coalescing of lesions result in blighting of a large part of the leaf blade
  • The affected areas dry out giving the leaf a scalded appearance
  • Translucent leaf tips and margins
  • Infected leaf tips also split near the midrib especially when there is a strong wind.

Identification of pathogen:

  • The conidia are borne on superficial stromata (compact masses of specialized vegetative hyphae) arising from lesions.
  • They are a bow to new-moon-shaped, single-celled when young and 2-celled when mature, occasionally 2-3 septate.
  • Asci are cylindrical to club-shaped and unitunicate (an ascus wherein both the inner and outer walls are more or less rigid and do not separate during spore ejection).
  • The ascospores are fusoid (tapering towards each end) straight or somewhat curved, 3-5 septate.


  • Avoid high use of fertilizer.
  • Chemicals such as benomyl, carbendazim, quitozene and thiophanate-methyl can be used to treat the seeds to eliminate the disease.
  • In the field, spraying of benomyl or fentin acetate or validamycin significantly reduces the incidence of leaf scald.
  • Foliar application of captafol or mancozeb or copper oxychloride also reduces the incidence and severity of the fungal disease.



  • TamilNadu Agritech Portal
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