Rootstock in vineyard planting decisions is chosen based on which factors?

• A. Rootstock is a grape variety
• B. Rootstock is a soil type
• C. Rootstock is chosen based on climate zone
• D. Rootstock is selected based on pests, water, pH, and vigour

Answer: (D)

Rootstock selection is driven by how the vine’s root system will interact with the site’s conditions. The rootstock must withstand pests, especially phylloxera, cope with the available water, tolerate the soil’s pH and nutrient environment, and influence the vine’s vigour. These factors determine root establishment, water and nutrient uptake, and how the canopy will need to be managed. Because these aspects directly shape vine health and production, choosing based on pests, water, pH, and vigour is the most accurate description of the decision criteria. Climate and general soil type can influence broader planning, but the rootstock decision itself hinges on these interacting factors.