Farming with Light: The Robot Fleets Replacing Chemical Fungicide Sprays

The most important new tool in fruit farming is not a chemical. It is light. Autonomous robots rolling through vineyards at night now bathe strawberries and grapevines in short-wavelength ultraviolet light, destroying fungal pathogens on contact without leaving a single drop of residue on the fruit. This week, the movement got its loudest validation yet: Saga Robotics, the Norwegian company behind the Thorvald platform, was named to TIME's List of the Best Inventions of 2026.

It is the latest sign that light-based crop protection, long treated as a laboratory curiosity, is crossing into commercial-scale food production.

How you kill a fungus with a lightbulb

The physics is straightforward. Antobot's machines, built by a Cambridge-based company that has been working on the problem since 2019, drive through strawberry fields carrying banks of UV-C lamps. UV-C is a shorter, more intense wavelength than the UV-A and UV-B in ordinary sunlight. When it strikes fungal pathogens such as powdery mildew, the mildew that robs strawberry growers of yield every season, it damages the organism's DNA so it cannot replicate and spread across the plant canopy.

Because the treatment works on contact rather than through a systemic chemical reaction, two things follow that matter enormously to growers. First, it leaves no fungicide residue on the fruit. Second, pathogens cannot easily evolve resistance the way they do against conventional sprays, which fail when a fungus stops absorbing or metabolizing the active ingredient. You cannot build resistance to having your DNA shattered.

Saga Robotics calls the whole approach "Farming with Light." Its Thorvald robots work autonomously at night, using precisely delivered UV-C to control powdery mildew in vineyards and strawberries. In 2026 alone, the company says Thorvald is protecting roughly 2,500 acres of California vineyards and treating an estimated 30 percent of the United Kingdom's tabletop strawberry production. The platform has come a long way from its origins as a 2014 master's project at the Norwegian University of Life Sciences; Saga Robotics was founded two years later, in 2016.

You cannot build resistance to having your DNA shattered. That simple physical fact is what makes light so disruptive.

The 300-robot target

The clearest signal that the technology has moved past pilot projects came from Antobot this week. The company confirmed in an October 1 interview with the trade publication AgFunderNews that it aims to have 300 of its UV-C robots working in fruit fields by 2027. Its customers already include Driscoll's, the global berry marketing and growing company, and Tiptree, the British jam and preserves maker that sources fruit from its own farms.

Antobot's business model is shifting in a way that signals maturity. Until 2025, the company ran its robots as a service, handling daily operation and maintenance while growers paid for the treatment outcome. In 2026 it is moving most customers toward buying and operating the machines themselves, a transition executives attribute partly to capital equipment grants available to horticulture businesses in the United Kingdom and Spain. Some growers now run more than ten machines on a single site, with one worker supervising several robots at once.

The company has funded its growth through government grants, a small seed round led by Intron Technology Holdings, and revenue from existing customers, and it is now seeking growth capital to ramp up manufacturing. Field-tested design changes, including swappable battery packs and a simplified suspension system, suggest a company refining a working product rather than proving a concept. Beyond strawberries, Antobot is developing versions for blueberries, raspberries, and vineyards, and its machines carry scouting modules that count fruit, measure ripening, and feed harvest data back into supply-chain planning.

One idea, a cluster of competitors

What makes this more than a two-company story is the competition. Antobot is not alone: AgFunderNews named Saga Robotics, TRIC Robotics, and CleanLight as fellow developers of UV-C treatment robots for horticulture. A cluster of companies, rather than a single patent holder, suggests the core idea has survived enough field testing to attract parallel investment.

That said, the data caveats matter. Antobot's commercial lead, Marc Jones, has spoken of large reductions in chemical spraying and encouraging yield increases, but the company has not published peer-reviewed trial data or specific percentage figures. Until independent university studies arrive, growers should treat the performance claims as company-reported. Saga's numbers, 2,500 acres and 30 percent of UK strawberry production, describe deployment scale rather than efficacy comparisons.

Why this matters beyond berries

Fungicide resistance is one of the quiet crises of modern food production. Growers worldwide lose an estimated share of every harvest to diseases that keep evolving around the chemicals meant to stop them, while regulators and consumers push for lower residues on food. A physical treatment that neither leaves residue nor breeds resistance attacks both problems at once, without asking growers to accept lower yields.

The secondary effects stack up. Lightweight electric robots replace diesel tractor passes, cutting soil compaction and carbon emissions, and they spare workers from handling fungicide sprays. The scouting modules turn each machine into a roaming data collector, mapping disease pressure and ripening in real time.

Ten years ago, farming with light was a master's thesis. This week, it landed on TIME's Best Inventions list while hundreds of robots lit up fields across three continents. The chemical era of crop protection is not over, but for the first time, it has a genuine competitor that works with physics instead of poison.