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    Question

    When were phloem-limited bacteria first observed, and

    which disease did they affect in citrus plants?
    A 1950; Peach phony disease Correct Answer Incorrect Answer
    B 1970; Citrus greening Correct Answer Incorrect Answer
    C 1980; Leaf scald Correct Answer Incorrect Answer
    D 1990; Leaf scorch Correct Answer Incorrect Answer

    Solution

    Citrus greening. Phloem-limited bacteria were first observed in 1970 in citrus plants affected with greenurg disease.

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