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.