What is the main function of lateral shoots, and when are they desirable or undesirable?

• A. They allow continued growth if the main shoot tip is damaged, and they can provide extra leaves; near-base growth can impede air flow and shade fruit
• B. They only shade the fruit
• C. They store carbohydrates
• D. They are not part of the canopy

Answer: (A)

Lateral shoots provide backup growth and extra leaf area, so they keep the canopy productive if the main shoot tip is damaged and help maintain photosynthesis with additional leaves. This makes them desirable when the apex is compromised or when extra vegetative growth is needed to sustain the vine’s canopy. But they can become a problem if they grow near the base and crowd the trunk area: they impede air flow and shade the fruit, reducing light to the clusters and increasing disease risk. They are part of the canopy and their role is tied to light capture and growth, not to storing carbohydrates.