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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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