When we talk about threats to vineyards, climate change usually gets most of the attention. Heatwaves, drought, spring frost and hailstorms regularly make headlines. But over the last few years another problem has quietly been spreading across European vineyards: Flavescence Dorée, one of the most serious forms of grapevine yellows disease, also known as Golden Yellowing or, in Hungary, Aranyszínű Sárgaság.
If you follow wine news, you may have noticed more and more reports about infected vineyards, uprooted vines and emergency measures. What was once considered a local issue has now become one of the biggest challenges facing grape growers in several European countries.
So what exactly is happening, and why should wine lovers care?
A Problem Hidden Inside the Vine
Flavescence Dorée is caused by a phytoplasma, a microscopic organism that lives inside the vine’s vascular system. Think of it as a disease that disrupts the vine’s internal transport network. Once a vine becomes infected, there is currently no cure.
The vine gradually weakens, yields decline, grapes struggle to ripen properly and, in many cases, the plant eventually dies. Some vineyards can lose a significant proportion of their vines within just a few years if the disease is left unchecked.
The good news is that the disease is completely harmless to humans. It does not affect the safety of wine and you cannot taste it in the glass. The real problem is what happens in the vineyard.
Is This Another Phylloxera?
For many wine lovers, any vineyard crisis immediately brings one historical disaster to mind: phylloxera.
In the late 19th century, phylloxera, a tiny root-feeding insect accidentally imported from North America, devastated vineyards across Europe. Millions of vines died, entire wine regions were transformed and the solution eventually came through grafting European grape varieties onto resistant American rootstocks.
Flavescence Dorée is different. The disease itself is not caused by an insect. Instead, it is spread by one.
The culprit is the American grapevine leafhopper (Scaphoideus titanus), a small insect that feeds on vine sap. When it feeds on an infected vine, it picks up the phytoplasma. When it moves to a healthy vine, it can pass the infection on.
Unlike phylloxera, there is currently no equivalent silver-bullet solution. Once a vine is infected, removal is usually the only option.
That is why growers take the disease so seriously.
How Did It Arrive in Europe?
Flavescence Dorée was first identified in France in the 1950s. Over the following decades it spread through several wine-producing countries including Italy, Switzerland, Slovenia, Croatia and Austria.
For many years it remained mostly a concern in southern Europe. Today the situation looks very different. The disease continues to move north, and new outbreaks are being recorded in regions that had previously remained unaffected.
One of the most significant developments came in late 2025, when Germany confirmed its first cases in Baden-Württemberg. At the same time, the American grapevine leafhopper was also present in the area, raising concerns about future expansion.
For many wine professionals, this was an important moment. It showed that grapevine yellows disease is no longer a challenge limited to southern Europe.
Why Is Hungary Suddenly Talking About It?
Although Hungary first detected Flavescence Dorée back in 2013, the disease attracted relatively little public attention at the time. That has changed dramatically. According to surveys carried out in 2025, infected vines have now been found in 21 of Hungary’s 22 wine regions. Some of the most severe damage has been reported in western Hungary, particularly around Zala and Sopron. In some cases growers have been forced to remove entire vineyard blocks.
The disease has also been detected in Tokaj and many other well-known wine regions. One of the most widely reported examples comes from the Bussay estate in Zala County, where the majority of the vineyard area was reportedly lost over just a few years due to the disease.
As a result, winegrowers, authorities and professional organisations have started treating the issue as a national priority. Several conferences, monitoring programmes and coordinated inspection campaigns have already been launched, but experts agree that the next few years will be critical.
How Does Grapevine Yellows Disease Spread?
Flavescence Dorée spreads in two main ways.
The first is through infected planting material. The second, and much more important route, is through the American grapevine leafhopper.
When the insect feeds on an infected vine, it acquires the phytoplasma. It then spreads the disease as it moves through the vineyard feeding on healthy vines.
This is one reason abandoned vineyards are becoming such a concern across Europe. Unmanaged vines can act as reservoirs for both the disease and the insects that spread it. Authorities across Hungary, Slovakia and other neighbouring countries have repeatedly highlighted abandoned vineyards as one of the biggest obstacles to controlling the disease.
Why Is It So Difficult to Stop?
One reason is that the disease often goes unnoticed at first. Symptoms can look surprisingly similar to drought stress, nutrient deficiencies or other vineyard problems.
Growers typically notice:
- Yellowing leaves on white grape varieties
- Reddening leaves on red grape varieties
- Leaves curling downward
- Poor ripening of shoots
- Reduced fruit development
- Weak vine growth
- Shrivelled grape clusters
Many growers initially blamed the symptoms on drought during the hot and dry 2025 season. In numerous cases, suspicion of Flavescence Dorée only arose once additional symptoms started to appear. Laboratory testing is often needed to confirm whether Flavescence Dorée is actually present.
Another challenge is that the insect responsible for spreading the disease survives winter surprisingly well. Its eggs are protected inside vine wood, meaning cold winters alone are usually not enough to eliminate populations.
The Organic Dilemma
One of the most controversial parts of the story involves organic viticulture. Because there is no direct treatment for the phytoplasma itself, growers focus on controlling the leafhopper population. This often means insecticide treatments.
For conventional growers this is already expensive and time-consuming. For organic producers it creates an even bigger challenge because some of the most effective products are not permitted under organic certification rules.
As the disease spreads, many wine regions are facing difficult conversations about how to balance environmental goals with the need to protect vineyards.
In Hungary, several organic producers have publicly raised concerns about large-scale insecticide programmes and the potential impact on beneficial insects and organic certification.
What Is Happening Across Europe in 2026?
The issue is no longer limited to a handful of regions:
- Champagne reported a dramatic increase in infected vines during 2024, prompting large-scale action plans and mandatory inspections.
- Slovakia has introduced quarantine measures in multiple districts and continues to expand monitoring efforts.
- Germany is dealing with its first confirmed cases.
- Hungary continues to expand surveillance and control programmes across its wine regions.
Meanwhile, researchers are looking for more sustainable ways to manage the American grapevine leafhopper and better understand how the disease moves through vineyards.
What was once considered a local viticultural issue has become a European challenge.
Why Wine Lovers Should Pay Attention
Most of us think about wine in terms of grape varieties, vintages and producers. But every bottle starts in the vineyard. Diseases like Flavescence Dorée affect how much fruit growers can harvest, how much money they need to spend protecting their vines and, in some cases, whether a vineyard can continue operating at all. For regions already dealing with climate change, labour shortages and rising production costs, this adds yet another layer of pressure.
Will Flavescence Dorée become the next phylloxera?
Probably not. The scale and nature of the threat are different. But it is one of the most important vineyard stories in Europe right now. And if you enjoy following what shapes the future of wine, it is definitely a name worth remembering.
FAQ: Grapevine Yellows Disease
Grapevine yellows disease is a group of diseases caused by phytoplasmas that interfere with the vine’s ability to transport nutrients. Flavescence Dorée is one of the most serious and economically damaging forms found in Europe.
No. Flavescence Dorée only affects grapevines and does not pose any risk to human health. Wines produced from affected vineyards remain safe to drink.
The disease is primarily spread by the American grapevine leafhopper (Scaphoideus titanus), which transfers the phytoplasma from infected vines to healthy ones while feeding.
Currently, there is no cure. Once a vine is infected, the most effective solution is usually to remove it to prevent the disease from spreading further.
The Author
