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    Which weed acts as an alternate host for blast disease in rice?
    Question

    Which weed acts as an alternate host for blast disease in rice?

    A.

    Cyperus rotundus

    B.

    Echinochloa colona

    C.

    Cyperus distans

    D.

    Leptochloa chinensis

    E.

    Answer not known

    Correct option is B

    Rice blast is caused by Magnaporthe oryzae.
    Some weeds harbor the pathogen during off-season.
    Echinochloa colona commonly acts as an alternate host. This helps disease survival and spread.
    Thus, weed management is essential. Therefore, option (b) is correct.

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