Dioscorea potexvirus

Dioscorea potexvirus (Potexvirus ecsdioscoreae) is a phytopathogenic virus belonging to the genus Potexvirus within the Alphaflexiviridae family. It is a systemic viral disease that primarily impacts plants within the Dioscorea genus, which are essential agricultural crops in various tropical and subtropical regions.

The primary hosts of this virus are various species of yams. The infection affects the overall plant health and is particularly problematic because the virus can persist within the tubers, leading to its transmission during the vegetative propagation process, which is the standard method for growing these crops.

Symptoms of the infection typically manifest as mosaic patterns on the leaves, chlorotic spots, and leaf deformation. In cases of severe infection, plants may exhibit stunted growth, which significantly hinders their ability to produce healthy tubers, affecting the overall physiological development of the plant.

The virus spreads within crop fields mainly through mechanical transmission during agricultural activities, such as cultivation or harvesting, and through the use of infected tubers as planting material. Environmental conditions that encourage physical contact between plants or the presence of common reservoirs facilitate the transmission of the virus.

The economic impact of the virus is significant, as it leads to reduced yields and lower quality of tubers. Control and prevention strategies are critical, focusing on the use of virus-free planting materials, rigorous sanitation practices, regular disinfection of agricultural equipment, and the systematic removal of infected plant debris to mitigate the spread of the disease.