Corsican winegrowers are facing a tough start to the 2025 season. Over 300 mm of rain since January has triggered early outbreaks of downy mildew, black rot, and botrytis. Some vineyards are still too wet for tractors, limiting disease control.
Downy mildew appeared on nielluccio as early as April 14—weeks ahead of normal. Grenache and carignan are also showing signs of mildew and powdery mildew. Botrytis has even affected shoots, causing them to rot.
Persistent humidity is also encouraging black rot and leaf diseases. Pest pressure is rising too, with beetles damaging vermentino leaves, snails unusually active, and early signs of leafhoppers.
Vine growth is behind last year, with uneven development across the island. Growers are hoping for drier, sunnier weather to regain control.