Grapevine vitivirus

Pathogen and disease type. The genus Vitivirus belongs to the Betaflexiviridae family of viruses. It causes systemic viral infections in perennial woody plants. The virus is primarily transmitted through infected propagation material, such as rootstocks or scions, as well as via contaminated grafting tools and pruning equipment during standard agrotechnical operations.

Crops and economic impact. The primary host is the grapevine (Vitis vinifera). Infection leads to chronic decline, known as vine degeneration, which significantly reduces yield and degrades fruit quality. Affected plants exhibit lower cold hardiness and vitality, leading to the premature death of the vine and a substantial decrease in the overall productivity of the vineyard.

Symptoms and signs of damage. Symptoms of vitivirus infection are often latent and difficult to distinguish without molecular testing. However, severe cases manifest as leaf curling, chlorotic patterns, shortened internodes, and stunted, zig-zag shoot growth. Additionally, the disruption of vascular tissues prevents proper nutrient transport, often resulting in poor berry ripening and weak cane development.

Conditions for development and spread. The virus is widely disseminated through the international and local trade of infected plant materials. Field spread occurs via contaminated pruning tools and, in some cases, by soil-borne nematodes that feed on infected roots. Warm climatic conditions during the growing season can exacerbate the internal stress of the plant, making symptoms more visible.

Protection and control measures. Management is strictly preventive as there is no chemical cure for viral plant infections. Essential strategies include:

• using exclusively virus-indexed, certified nursery stock;
• rigorous disinfection of all pruning and grafting tools;
• immediate roguing and destruction of symptomatic or infected plants;
• monitoring and managing soil-borne vectors;
• performing regular PCR-based diagnostic testing of vineyard blocks.