Effect of Rootstock on Vineyard Establishment Using Green-Growing Benchgrafts

Abstract

Demand for vine plant material has increased drastically due to the ongoing expansion of viticulture, and recent widespread replanting efforts. Nurseries and growers are turning to green-grafted vines to meet demand. Unfortunately, most vineyard establishment studies have centered around dormant benchgrafted vines. Thus, little is known regarding the specific establishment trends of green-growing benchgrafts. This study aimed to explore the role rootstock selection has in green-growing benchgraft establishment and development over the first four years post-planting. Vitis vinifera L. cv. Sauvignon blanc was grafted onto multiple rootstocks of varying parentage, including ‘101-14MGT’ (V. riparia × V. rupestris), ‘1103P’ (V. berlandieri × V. rupestris), ‘110R’ (V. berlandieri × V. rupestris), ‘420A MGT’ (V. berlandieri × V. riparia), and ‘Teleki 5C’ (V. berlandieri × V. riparia). The experimental site was organized using a completely randomized design (n = 12) with all vines managed to industry-standard cultural practices. Vines grafted onto 1103P had the largest average trunk diameter (p = 0.0012) and circumference (p p p = 0.0008). The larger trunk size and more extensive carbohydrate reserves suggest that green-growing benchgrafts using 110R or 1103P have a higher capacity and likelihood of establishment success.

Keywords

• <i>Vitis vinifera</i>
• rootstock
• grafting
• establishment
• non-structural carbohydrates
• California Central Coast