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
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Causative agent: Bipolaris oryzae, Helminthosporium oryzae

(Syn: Drechslera oryzae) (Sexual stage: Cochliobolus miyabeanus)

Bengal famine:  1942-1943


  • Infected seedlings have small, circular, yellow brown or brown lesions that may girdle the coleoptile and distort primary and secondary leaves.
  • Starting at tillering stage, lesions can be observed on the leaves. They are initially small, circular, and dark brown to purple-brown.
  • Fully developed lesions are circular to oval with a light brown to gray center, surrounded by a reddish brown margin caused by the toxin produced by the fungi.

BROWN SPOT IN RICE – casual organism, favourable conditions, symptoms and  management methods

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