Pelargonium zonate spot virus

Pelargonium zonate spot virus (PZSV) is a plant-pathogenic virus belonging to the genus Anulavirus. This virus represents a significant challenge in ornamental horticulture and greenhouse crop production, as it causes systemic infections that negatively impact plant vitality, aesthetics, and overall economic value.

While primarily associated with Pelargonium species, the host range of this virus is notably broad. It can infect various important agricultural and ornamental crops, including species within the Solanaceae and Asteraceae families, which increases the risk of cross-contamination in diversified garden settings or mixed greenhouse environments.

The characteristic symptoms include the formation of chlorotic or necrotic rings, zonate spots, and mosaic patterns on the foliage. In severe cases, growers may observe leaf distortion, stunted plant growth, and a general decline in plant vigor, which eventually leads to the inability to market the affected floral products.

The spread of the virus within crops is primarily mediated by insect vectors, specifically thrips, such as the western flower thrips. Furthermore, mechanical transmission is a major concern; contaminated pruning tools or contact during vegetative propagation can easily spread the virus from symptomatic plants to healthy ones if sanitation protocols are neglected.

Effective management requires a multi-layered approach centered on strict phytosanitary practices. Key strategies include:

• Regular monitoring and elimination of symptomatic plants.
• Rigorous control of thrips populations using insecticides.
• Sanitization of tools using appropriate disinfectants.
• Sourcing certified virus-free starting plant material.