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: Rhizoctonia solani (Sexual stage: Thanetophorus cucumeris).

  • Affect tillering to heading stage .


  • Initial symptoms are noticed on leaf sheaths near water level.
  • On the leaf sheath oval or ellipticalor irregular greenish grey spots are formed.
  • As the spots enlarge, the centre becomes greyish white with an irregular blackish brown or purple brown border.
  • Sheath blight has symptoms similar to stem rot and stemborer infestation.
  • To confirm the cause of disease, check for irregular lesions usually found on the leaf sheaths (initially water-soaked to greenish gray and later becomes grayish white with brown margin).
  • Also check for presence of sclerotia.

Rice Sheath Blight

Join the conversation