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      Question

      Under what conditions do Phytophthora root and stem rots

      occur?
      A When the soil is too dry Correct Answer Incorrect Answer
      B When the temperature is too high Correct Answer Incorrect Answer
      C When the soil is too wet and the temperature is between 15 and 23°C Correct Answer Incorrect Answer
      D When the soil is too alkaline Correct Answer Incorrect Answer

      Solution

      Phytophthora root and stem rots cause damage to their hosts in nearly every part of the world where the soil becomes too wet for the good growth of susceptible plants and the temperature remains fairly low, i.e., between 15 and 23°C.

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