Question

    Black spot disease in roses is caused by _____

    A Botrytis Correct Answer Incorrect Answer
    B Diplocarpon Correct Answer Incorrect Answer
    C Alternaria Correct Answer Incorrect Answer
    D Fusarium Correct Answer Incorrect Answer

    Solution

    Black spot is the most serious disease of roses. It is caused by a fungus, Diplocarpon rosae, which infects the leaves and greatly reduces plant vigour.

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