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    Question

    What is the characteristic symptom of Alternaria leaf

    spots caused by Alternaria solani on tomato plants?
    A Light green concentric circles on leaves Correct Answer Incorrect Answer
    B Black necrotic lesions on stems Correct Answer Incorrect Answer
    C White powdery growth on fruit surfaces Correct Answer Incorrect Answer
    D Dark brown spots with concentric rings on leaves Correct Answer Incorrect Answer

    Solution

    Alternaria solani causes dark brown spots with concentric rings on leaves, giving a "target board effect."

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