Capraria leaf curl begomovirus

Capraria leaf curl begomovirus is a plant-pathogenic virus belonging to the genus Begomovirus within the family Geminiviridae. These viruses are characterized by a circular, single-stranded DNA genome and are known for causing devastating diseases in numerous agricultural crops. The virus is primarily recognized by its ability to induce severe physiological changes in the host plant.

The host range of this virus includes various wild species, such as Capraria biflora, as well as several economically important crops. The virus interacts with the host's cellular machinery, leading to stunted growth and impaired photosynthetic capacity. Because the virus is systemic, it spreads throughout the plant vascular system, making localized treatment impossible once an infection is established.

Typical symptoms and signs of infection involve significant leaf curling, puckering, and inward or outward rolling of the leaf edges. Infected plants often display a characteristic yellow mosaic or vein clearing pattern. In many cases, the reduction in foliage size and the deformation of flowers or fruits lead to a total loss of commercial value for the crop.

The conditions for development and transmission are strictly dependent on the whitefly Bemisia tabaci. This insect acts as a vector, acquiring the virus from an infected plant and transmitting it to healthy ones through its piercing-sucking mouthparts. The rapid proliferation of the whitefly in warm climates and during dry seasons significantly accelerates the spread of the virus within a field or greenhouse.

Control and prevention measures must be multifaceted to be effective. Since there are no curative treatments for viral diseases, management focuses on exclusion and vector control:

• Elimination of weeds that serve as alternate hosts for the virus.
• Implementation of intensive pest management programs to control whitefly populations.
• Utilization of virus-free planting stock and resistant crop varieties.
• Use of physical barriers, such as insect-proof netting, in greenhouse environments.
• Rotation of crops to reduce the survival of vectors in the field.