Polygonum ringspot orthotospovirus

Orthotospovirus polygonianuli is a dangerous plant viral pathogen belonging to the genus Orthotospovirus within the Tospoviridae family. This viral disease is characterized by systemic infection of the plant host, leading to significant disruption of physiological processes and a reduction in agricultural crop yields.

The primary hosts of this virus are members of the Polygonaceae family, particularly various species of knotweed or smartweed (Polygonum). The virus is capable of infecting both wild weed species and cultivated plants, which creates a persistent reservoir of infection in agricultural ecosystems and complicates the control of the pathogen's spread.

Characteristic signs of infection include the appearance of ringspots, chlorotic mosaic on leaf blades, tissue deformation, and overall stunted growth. Depending on the severity of the infection, symptoms may manifest as localized lesions or systemic necrosis, often resulting in the death of individual plant parts or the entire plant.

In nature, the virus is primarily transmitted via insect vectors, specifically various species of thrips. Environmental conditions characterized by high humidity and warm temperatures facilitate the active reproduction of these vectors, which directly correlates with the intensity of viral outbreaks in fields and greenhouse facilities.

• Use of certified virus-free planting material.
• Systematic monitoring of insect vector populations (thrips).
• Application of insecticides to control virus vectors.
• Removal of weed species that serve as virus reservoirs.
• Implementation of crop rotation and spatial isolation.

The economic impact of Orthotospovirus polygonianuli lies not only in direct yield losses but also in the degradation of product quality. Effective control relies on an integrated approach combining quarantine measures, agronomic practices, and chemical management of the insect vectors responsible for the spread of the virus.