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    Question

    Bacterial leaf blight of rice caused by Xanthomonas

    oryzae can be identified by
    A Wilting of plant Correct Answer Incorrect Answer
    B Yellowing of leaves Correct Answer Incorrect Answer
    C Ooze test Correct Answer Incorrect Answer
    D Defoliation Correct Answer Incorrect Answer
    E Rusting Correct Answer Incorrect Answer

    Solution

    Bacterial leaf blight of rice caused by Xanthomonas oryzae can be identified by ooze test. When the infected leaves are cut into small bits and put into water in a glass tube, the water becomes turbid and yellowish after the lapse of 30-60 minutes. This turbidity is due to the release of bacterial cells into water from the cut ends of the leaf bits.

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