Discussion
The causal organism for rice blast disease is ...............................
Answer: B
Rice blast is caused by Magnaporthe grisea.
Rice blast, the most destructive fungal disease of rice, is caused by the ascomycete Magnaporthe grisea (the rice pathogen is now often called Magnaporthe oryzae; its asexual state is Pyricularia). It forms diamond-shaped leaf lesions and can rot the panicle neck. The fungus breaks into leaves with a melanised appressorium under great turgor pressure.
Xanthomonas oryzae causes bacterial leaf blight, Rhizoctonia solani causes sheath blight, and Helminthosporium oryzae causes brown spot, the disease behind the Bengal famine of 1943.
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