Potato latent virus

The causative agent of this disease is a virus belonging to the genus Carlavirus, formally classified as Carlavirus latensolani. This phytopathogenic virus is responsible for systemic infections in host plants, significantly impacting their physiological health and overall biomass production. It is a critical concern for potato pathology.

The primary host for this virus is the potato (Solanum tuberosum). However, the virus can also infect other members of the Solanaceae family, which may act as secondary hosts or reservoirs, allowing the pathogen to persist in the environment even in the absence of the main crop.

Symptoms of the infection are often subtle or completely absent, which is why it is termed a "latent" virus. When symptoms do appear, they typically manifest as mild leaf mosaic, subtle vein clearing, or minor curling. Despite these minimal visual symptoms, the physiological cost to the plant is high, leading to reduced tuber size and lower commercial grade quality.

The virus is primarily spread through biological vectors, with various aphid species serving as the most common agents of transmission. The transmission is non-persistent, meaning the virus is acquired and transmitted by the insect vector very quickly. Additionally, mechanical transmission during agricultural activities and the use of infected tubers for planting are major routes of spread.

The economic impact of Carlavirus latensolani is characterized by the degradation of potato varieties over several growing seasons. To mitigate the risk of infection, growers should adopt the following practices:

• Relying on certified virus-free seed tubers for all plantings.
• Implementing strict aphid control programs during the critical stages of plant growth.
• Conducting regular field inspections to rogue out symptomatic plants.
• Maintaining effective weed control to remove alternative virus hosts from the vicinity.