Grapevine vein necrosis

Grapevine vein necrosis is a graft-transmissible disease that affects various Vitis vinifera cultivars. The pathogen is typically associated with complex virus infections that colonize the phloem tissues of the vine, causing systemic disruption of the nutrient transport system.

The disease primarily impacts commercial vineyards and nurseries, where the use of infected propagation material facilitates the spread of the pathogen. Once a vine is infected, the agent remains in the systemic tissues for the entire lifespan of the plant, often leading to chronic decline in vigor.

Symptoms of vein necrosis are most observable on the leaves, where fine necrotic patterns form along the veins. In severe infections, these symptoms can lead to leaf rolling, chlorosis, and premature senescence, which significantly impacts photosynthetic capacity and overall berry yield.

The progression of the disease is influenced by environmental stress and the specific compatibility between the scion and the rootstock. In many cases, the disease remains latent until the plant experiences physiological stress, such as drought or excessive fruit load, which triggers the onset of visible necrotic signs.

Control measures are strictly preventive because no curative treatments are available for this viral condition. Essential strategies include:

• Utilizing certified virus-free rootstocks and scions.
• Rigorous sanitation practices during the grafting process.
• Regular inspections of vineyards to identify and rogue symptomatic vines.
• Implementation of hot-water treatments for dormant nursery cuttings.