Flavescence dorée

Flavescence dorée is a devastating quarantine disease affecting grapevines, caused by the phytoplasma Candidatus Phytoplasma vitis. This specialized pathogen colonizes the plant's phloem, causing systemic infection that severely compromises the health and productivity of the vineyard.

The primary hosts of this disease are cultivars of Vitis vinifera. Once infected, the phytoplasma interferes with the plant's ability to distribute nutrients, leading to reduced vigor and, in severe cases, the complete death of the vine. It is one of the most economically significant threats to viticulture worldwide.

Symptoms typically manifest as yellowing or reddening of leaves, depending on the cultivar, accompanied by distinctive leaf rolling. Shoots often exhibit poor lignification, remaining green and flexible, which makes them highly susceptible to frost damage during winter. Fruit set is usually compromised, leading to shriveling and cluster drop.

The disease spread is intrinsically linked to its primary vector, the leafhopper Scaphoideus titanus. This insect acquires the phytoplasma by feeding on infected vines and subsequently transmits the pathogen to healthy plants. Understanding the life cycle of this vector is critical for predicting and managing disease outbreaks.

Management strategies focus on prevention and strict phytosanitary measures. Key actions include:

• Sourcing certified, disease-free nursery stock.
• Rigorous monitoring and removal of symptomatic vines to eliminate pathogen reservoirs.
• Targeted insecticide applications to control the Scaphoideus titanus population.
• Eliminating wild host plants or abandoned vineyards that may serve as sources of infection in surrounding areas.