At what point of the vine growing cycle is water stress not desired?

• A. Early budburst
• B. Mid fruit set
• C. Late stages of shoot growth
• D. Dormancy

Answer: (C)

Water during growth must meet the vine’s demand as shoots are elongating and leaves are expanding. In the late stages of shoot growth the vine is still building canopy and relies on ample water to keep cells expanding and to sustain high photosynthetic activity while accumulating energy reserves. If water becomes limiting at this point, stomata close, photosynthesis drops, leaf area development can slow, and the vine may not accumulate enough carbohydrates for later berry development and for next year’s bud formation. That combination makes water stress particularly undesirable here. Early budburst and flowering periods are sensitive to drought because they affect flowering and fruit set, while dormancy is a low-activity phase where water status is less immediately critical.