The French Government has promised to help winegrowers in the Bordeaux region, some of whom lost their entire crop in storms at the weekend.
Cyril Giresse, who runs the Chateau Gravettes Samonac in the Cotes de Bourg appellation, said hailstones "the size of pigeons' eggs" destroyed grape buds and left vines bare.
"The storm lasted only 15 minutes, but in some places, there's nothing left," he said, "just the vines stripped as if the grapes had been picked."
Jean-Dominique Chateau, another producer, said: "I've got nothing left. I've been growing grapes for 33 years and this is the worst storm I've ever seen. Last year we lost 40 per cent of our crop to hail but this year it's even worse."
Stephane Travert, the agriculture minister, said: "We'll take the necessary measures and we're ready to meet Bordeaux winemakers."