Grapevine corky bark

Grapevine corky bark is a significant viral disease associated with the Grapevine corky bark-associated virus (GCBV). It is categorized as a degenerative disorder that disrupts the systemic function of the vine, specifically interfering with the vascular system and the translocation of nutrients essential for growth and fruit development.

The disease exclusively affects grapevines (Vitis species). The primary mode of transmission is through the use of infected propagation material, such as grafting wood, cuttings, and nursery stock. It is a persistent infection, meaning once a plant is infected, the virus remains within the vine throughout its entire life cycle.

Typical symptoms often appear on the basal parts of the current season's shoots. Affected canes show swelling at the nodes, followed by the development of characteristic longitudinal cracks and a rough, corky appearance of the bark. Foliage may exhibit premature yellowing or reddening and downward curling, signaling a severe systemic disturbance.

The economic impact of this disease is substantial. Infected vines show a progressive decline in vigor, resulting in drastically reduced yields and poor grape quality. Over time, the inability of the vine to properly transport sap leads to stunted growth, increased susceptibility to cold damage, and ultimately, the premature death of the plant.

• Use certified virus-tested propagation material.
• Implement strict sanitation protocols for pruning tools.
• Rogue and destroy infected vines as soon as identified.
• Monitor vineyard health regularly for early signs of decline.

There is no chemical cure for Grapevine corky bark once a plant is infected. Consequently, prevention is the only effective management strategy. Maintaining a high standard of sanitary conditions in the nursery and the field is critical to preventing the spread of the virus across the vineyard acreage.