Vernoniavenae begomovirus

Vernoniavenae begomovirus is a plant pathogen classified within the Begomovirus genus of the Geminiviridae family. As a DNA virus, it infects the host plant at the vascular level, specifically colonizing the phloem, which leads to systemic physiological dysfunction and stunted development of the affected plant species.

This virus primarily affects hosts within the Asteraceae family. Its common occurrence in specific weed species of the Vernonia genus marks these plants as natural reservoirs, posing a significant risk of spillover infection to various agricultural crops cultivated in adjacent areas or tropical and subtropical regions.

Infected plants typically exhibit distinct symptoms, including yellow mosaic patterns on leaves, leaf curling, crinkling, and significant chlorosis. These physiological changes impair the photosynthetic capacity of the plant, resulting in stunted growth, reduced biomass, and in severe cases, the complete loss of marketable yield.

The transmission mechanism of the virus is highly dependent on insect vectors, primarily whiteflies (Bemisia tabaci). The virus is acquired by the vector during feeding on infected plant tissues and is subsequently transmitted to healthy plants. The efficiency of this transmission makes the vector population the primary target for disease management.

Managing and preventing the spread of this begomovirus requires a strict integrated pest management (IPM) strategy focused on breaking the disease cycle:

• Implementing rigorous whitefly population management using systemic insecticides.
• Removing weed hosts that serve as environmental reservoirs for the virus.
• Utilizing certified virus-free planting material to prevent initial introduction.
• Establishing spatial isolation zones to reduce the movement of vectors from infested areas.