American pepper leaf curl virus

The causative agent of the disease is the American pepper leaf curl virus (APLPV), belonging to the Ilarvirus genus. It is a phytopathogenic virus that targets the plant's vascular system, causing systemic infection and disrupting metabolic processes. The disease manifests as a viral mosaic, significantly impairing the photosynthetic efficiency of the host plant.

The primary host crop is pepper (Capsicum), although the virus may affect other Solanaceae species as well. Infection typically spreads through contaminated seeds, infected nursery stock, and mechanical transmission during cultivation practices. There is also potential for transmission via specific insect vectors often associated with this viral group.

Symptoms of the infection include characteristic leaf curling, chlorotic spots, and mosaic patterns on the leaves. In severe cases, significant deformation of fruits occurs, alongside stunted growth and a substantial reduction in overall plant biomass. Because these symptoms can overlap with other viral diseases, laboratory diagnostics are essential for accurate identification.

Conditions favorable for disease development are closely linked to temperature regimes and plant density. The virus spreads most effectively in warm climates when primary sources of infection, such as weed reservoirs, are present. High humidity levels may facilitate the movement of insect vectors within greenhouses or field environments.

The economic impact of the virus is characterized by a sharp decline in fruit quality and total yield. Under conditions of heavy infestation, losses can reach 50–70% of the potential yield. Prevention strategies include the use of certified virus-free seeds, strict adherence to quarantine protocols, weed control, and regular sanitation of agricultural tools to prevent mechanical transmission.