Rootstocks are an essential component of winegrowing in New Zealand. It is generally known that rootstocks can confer favourable properties on the grafted plant, including insect resistance, tolerance of soil biotic and abiotic conditions, and other impacts on the scion. However, the industry does not have robust knowledge relevant to local conditions to make informed choices about the best rootstock options for a particular planting situation.

In addition, new adaptation strategies are required to deal with the changing climate, and using more water-efficient rootstocks is a potential solution.

BRI has developed a trial to generate this knowledge to support rootstock choice with 15 different rootstocks. Focusing on Sauvignon Blanc, the trial aims to identify rootstocks that will confer drought tolerance and maximise the productive water use efficiency while maintaining high productivity and the characteristic style of Sauvignon Blanc that consumers expect.

The findings from the rootstock trial will contribute to the Sauvignon Blanc Grapevine Improvement programme and other future BRI programmes.

Resources available from this project

Article: Water use efficiency of 11 rootstocks under deficit irrigation

Article: New rootstock trial block planted

Article: Introducing the new BRI rootstock trial

Project summary

Researchers: Dr Carmo Vasconcelos, Bragato Research Institute

Years: 2022-2025

Funding: Bragato Research Institute

The rootstocks being trialled are:

Riparia Gloire, SO 4, Kober 5BB, Kober 125 AA, Malegue 44-53, Couderc 3306, Couderc 3309, Couderc 3309 2, Mgt 101-14, Schwarzmann, Richter 99, Richter 110, Paulsen 1103, Ruggeri 140, Ramsey