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      Question

      In Citrus, 'Rootstock' selection is primarily used for

      controlling:
      A Citrus Canker Correct Answer Incorrect Answer
      B Tristeza and Phytophthora Correct Answer Incorrect Answer
      C Powdery Mildew Correct Answer Incorrect Answer
      D Zinc deficiency Correct Answer Incorrect Answer

      Solution

      Many citrus scions are susceptible to soil-borne diseases and viruses that the rootstock can resist. Choosing the right stock is the first line of defense against systemic orchard decline.

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