California Vineyards Deploy UV-C Robots

Autonomous robots treat 2,600 acres to manage powdery mildew without chemicals.

Updated on Oct. 15, 2026 in Robotics

Live Poll

Should farms replace chemical pesticides with autonomous UV-C light robots to manage crop diseases?

During the 2026 season, California vineyards deployed autonomous robots to manage powdery mildew using UV-C light. The effort treated 2,600 acres as growers sought to reduce reliance on chemical fungicides.

Why it matters

This shift toward non-chemical pest management addresses the recurring threat of powdery mildew, a persistent agricultural challenge that typically requires consistent fungicide application.

The Thorvald platform utilizes 254-nanometer UV-C light to disrupt pathogen DNA. It handles row widths between 3 and 10 feet and supports trellis crossarms up to 30 inches.

The players

Saga Robotics

A developer of autonomous agricultural robotics platforms that utilize battery-powered units for crop management.

Cornell AgriTech

A research branch of Cornell University focused on agricultural science and viticulture pathology.

Silver Oak

A California winery testing autonomous robotics for pest control in their pinot noir and sauvignon blanc blocks.

Bonterra Organic Estates

A winery focused on organic viticulture that deployed robots across 200 acres of chardonnay.

The details

The Thorvald robot navigates using real-time kinematic GPS to maintain precise positioning around obstacles while moving through vineyard rows. It delivers a low-dose UV-C light treatment at night, which is critical because sunlight triggers DNA repair mechanisms in the mildew that would otherwise neutralize the treatment. This contact-based method leaves no chemical residue on the vines.

2020: Saga Robotics partnered with Cornell AgriTech for development.
April 2026: Silver Oak made an initial fungicide application.
July 2026: Veraison and conclusion of initial robot test period.
2026 season: Vineyards used UV-C robots to treat mildew.

The Tech Race

This development follows an active research program at Cornell AgriTech aimed at replacing chemical fungicides with photobiology-based interventions. It marks a transition from field trials to commercial-scale adoption within the California viticulture industry.

California wineries are currently analyzing fruit samples to determine if the transition from fungicides to light treatment impacts wine quality. Consumers may eventually see these practices adopted as a standard in organic and conventional vineyard pest management.

The takeaway

The industry is shifting toward precision light-based technology to control mildew without chemical residues. Watch for upcoming quality reports from Silver Oak to confirm if these autonomous light treatments maintain the flavor integrity of the final vintage.