This project trialled UV-C technology in Sauvignon blanc grapes for control of powdery mildew, a widespread problem for New Zealand vineyards, with most requiring protection in the form of fungicides.

Internationally, UV-C light technology has shown to be a cost-effective and environmentally friendlier option to control powdery mildew.

A UVEX UV-C system coupled with Burro autonomous mobile robots was used for the application of the UV-C treatment in the Brigato Research Institute (BRI)-A Lighter Touch project. The trial was also supported by Agri Automation and Whitehaven Wines.

Findings from the first year showed promise, but improved results could likely be achieved from modifications to the UVEX equipment. BRI is keen to trial this modification when the equipment is made available; however, this means a planned second year of the trial will not occur this season.

UV light has shown to be effective against numerous fungal pathogens and other ALT stakeholders are looking to this technology to help reduce fungicide use in their crops. The findings from this project supported further potential trial work from other product groups and added to the understanding of the efficacy of UV-C light under New Zealand conditions against different plant pathogens and on different crops.

Watch a video case study below and read articles about this project and another UV-C trial being conducted in a cherry orchard:

• November 2024: UV-C technology trialled in wine grapes and summerfruit
• July 2025: UV-C shows success in summerfruit trial
• October 2025: UV-C shows efficacy for powdery mildew control in grapes 

The video below provides an overview of the project and its aims.