Course Content
Common bunt of wheat
Angular leaf spot/ bacterial blight/boll rot/black arm of cotton
Rice tungro virus
Rice grassy stunt virus
Rice ragged stunt virus
Rice yellow dwarf disease
Learn crop diseases and their management with Braimy- B.Sc agriculture
About Lesson

Causative agent:  Sphaerulina oryzina (syn. Cercospora janseanaCercospora oryzae).


  • Panicle initiation.
  • Light to dark brown, linear, and progress parallel to the vein.
  • On glumes, lesions are usually shorter but can be wider than those on the leaves. Brown lesions are also found on pedicels.
  • The disease also causes discoloration on the leaf sheath, referred to as “net blotch” because of the netlike pattern of brown and light brown to yellow areas
  • Narrow brown spot can be confused with white leaf streak. White leaf streak are oblong, white to creamish white, delimited by narrow brown margins, amphigenous, and interveinal.

Narrow brown leaf spot (Cercospora janseana ) on rice (Oryza sativa ) -  5390516

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