Grapevine vein yellowing

Grapevine vein yellowing is a viral disease caused by the Grapevine vein yellowing virus (GVYV). It is a systemic infection that primarily affects the vascular tissue of the grapevine, significantly impairing its physiological processes and overall vigor.

The disease typically affects Vitis vinifera cultivars. As a viral infection, it remains within the plant throughout its lifespan, often causing cumulative stress that leads to reduced longevity of the vineyard blocks.

The primary symptom is a distinct yellowing of the leaf veins, which is most observable on young leaves during the spring. This chlorosis can progress to cover the entire leaf, and in severe cases, it causes leaf deformation and poor shoot development, which weakens the plant's ability to store carbohydrates.

Transmission of the disease primarily occurs through infected propagation material. Mechanical transmission via contaminated pruning equipment is also a significant factor in spreading the virus across a vineyard. Consequently, the pathogen moves easily from plant to plant if proper hygiene protocols are not followed during seasonal maintenance.

Control measures are strictly preventative since there is no chemical cure for vine viruses. Management focuses on rigorous screening of nursery stock, selecting only virus-indexed vines, and maintaining strict sanitation practices, including the sterilization of tools between plants. Infected vines should be identified early, removed, and destroyed to protect the health of the surrounding plantation.