Less chemistry.
Same harvest.
New research from French vineyards shows how smarter pest management can sharply reduce chemical treatments while protecting grape production.
at a glance.
What if vineyards could use significantly fewer pesticides without sacrificing the harvest? A study published in OENO One suggests that, under the right conditions, they can.
Published on 28 October 2026, the research examined ways to make grape growing more sustainable without undermining farm economics. Nineteen winegrowers across the Cahors, Fronton and Gaillac regions of southwestern France took part in on-farm experiments over two growing seasons.
Researchers evaluated four different approaches: integrated pest management, zero-residue production, biocontrol-based protection and organic farming with restricted copper use. Their goal was not merely to reduce spraying, but to identify approaches that growers could realistically use while maintaining acceptable yields and costs.
The numbers tell an encouraging story.
Two approaches stood out. Compared with the study's High Environmental Value reference benchmark, integrated pest management reduced pesticide treatment frequency by an average of 32.1%, while the zero-residue strategy achieved a 42.2% reduction.
*Treatment-frequency reductions are relative to the study's High Environmental Value reference. The biocontrol-only approach reduced conventional pesticide treatments most, but disease control and economic outcomes were less reliable.
Compared with the participating growers' own conventional practices, the reductions were 17.9%, 29.7% and 80.7%, respectively. Crucially, the more balanced strategies generally preserved satisfactory grape yields while lowering fungicide costs.
A smarter way to protect the vine.
The lesson is not that vineyard protection should disappear. It is that the timing, choice and intensity of treatments matter. Researchers explored decision-support tools that help growers judge when spraying is necessary and when an application can safely be avoided.
They also tested substituting certain conventional fungicides with biocontrol products. These approaches are especially relevant to European viticulture, where diseases such as downy mildew and powdery mildew can threaten entire harvests.
Reducing treatments is most promising when protection becomes more precise—not when it is removed indiscriminately.
Key takeaway from the research
The limits of going fully biological.
One strategy achieved an 87.8% reduction relative to the benchmark, the largest decrease recorded. But the biocontrol-only approach struggled to control disease consistently and was less reliable economically. The distinction matters: fewer treatments do not automatically mean a viable vineyard.
Weather added another layer of complexity. The wetter 2021 season intensified disease pressure, while the warmer, drier conditions of 2022 created a different set of decisions for growers. Effective strategies must therefore adapt to local weather, grape varieties and vineyard conditions.
Selective intervention can lower treatment frequency while retaining protection where it matters.
Rainfall, disease pressure and vineyard economics determine whether a strategy succeeds.
Why the wine industry should pay attention.
Across Europe, wine producers are under pressure to cut environmental impacts while protecting margins. This research points to a practical middle ground: use less, apply better and measure outcomes carefully.
For growers in France, Switzerland and other wine regions, the findings suggest possible ways to reduce some input costs and respond to interest in more environmentally responsible wine. Still, the study involved a limited number of farms and seasons. Broader trials are needed before the findings can be applied universally.
A more sustainable vintage starts with better decisions.
Perhaps the most important finding is that environmental progress and economic performance need not always pull in opposite directions. By combining scientific research, decision-support systems and real vineyard experience, producers may be able to meaningfully reduce pesticide use while maintaining productive vineyards.
For an industry navigating climate pressure, rising expectations and changing demand, that is a promising direction—provided that sustainability is measured not just by how little is sprayed, but by whether farms remain resilient.
On-farm experimentation to reduce pesticide use in viticulture: evidence from Southwestern France. OENO One, Volume 60, Issue 4 (2026).
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