Sommelier

Category - Winemaking, &c

Which of the grape diseases infects the plants and leaves the stems and leaves covered in powdery spots?
  1. Pierce’s disease
  2. Phylloxera
  3. Downy mildew
  4. Powdery mildew
Explanation
Answer: D - Powdery mildew is a grape disease that infects vines and leaves a powdery mildew on the leaves and stems of the vines. It is a fungal disease that decreases the grape yields of the vines. Fortunately, powdery mildew is treatable.
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