Dioscorea mosaic virus

The Dioscorea mosaic virus (Potexvirus marmordioscoreae) is a pathogenic plant virus belonging to the Potexvirus genus. It acts as an obligate parasite, impacting the host plants' metabolic pathways and significantly disrupting their growth and development cycles, which leads to substantial losses in agricultural productivity.

This virus primarily affects species within the Dioscorea genus, commonly known as yams. These plants are essential staple crops in many tropical regions, and the emergence of such viral infections poses a major threat to local food stability and agricultural profitability if not managed correctly.

Clinical signs of infection are typically manifested as mosaic-like patterns on leaves, characterized by chlorotic spots and intricate marbled discolorations. Affected plants often exhibit symptoms such as stunted growth, leaf deformation, and a reduced capacity to produce healthy, marketable tubers during the harvesting phase.

The transmission and spread of Potexvirus marmordioscoreae are mainly linked to vegetative propagation and mechanical contact. Infected tubers used for planting are the primary source of initial outbreaks. Furthermore, the virus can be easily spread by contaminated pruning tools or physical interaction between adjacent plants in the field.

Effective management and prevention strategies are essential to curb the virus's impact. Key practices include:

• Strict adherence to using virus-free, certified planting material.
• Regular sanitation of all agricultural tools with appropriate disinfectants.
• Immediate removal and destruction (rogueing) of symptomatic plants to minimize secondary spread.
• Implementation of field hygiene protocols during cultivation and harvesting stages.