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.
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