Potato tuber yellowing potyvirus

Potyvirus tuberosiflavi is a viral pathogen affecting potato crops, characterized by systemic infection and specific symptoms in tuber tissues. As a member of the Potyvirus genus, it interferes with the plant's physiological functions, severely impacting plant development and the overall quality of the harvest.

The primary host for this pathogen is the potato plant. The virus thrives within the host's vascular system, ensuring its persistence throughout the growing cycle. Infected tubers are the primary reservoir of the disease, allowing it to survive through winter storage and propagate the infection in subsequent cropping seasons.

Symptoms of the infection include chlorosis, leaf mottling, and mosaic patterns on the foliage. The most distinct manifestation, however, occurs within the tubers, where internal yellowing and tissue necrosis may appear. Such physiological degradation significantly reduces the marketability and nutritional quality of the potato crop.

The virus is primarily transmitted by aphid species that act as biological vectors, moving the pathogen from infected plants to healthy ones. Additionally, mechanical transmission occurs through contact with contaminated farm equipment, harvesting tools, or hands, facilitating the rapid spread of the virus within a field or between adjacent plots.

Effective management requires a strict reliance on virus-free certified seeds, as there are no direct chemical treatments to cure an already infected plant. Integrated pest management, focusing on controlling aphid populations, along with robust sanitation practices and rogueing infected plants, remains the most effective strategy for mitigation.

• Use of high-quality certified seed potatoes
• Vector control through strategic insecticide use
• Regular inspection and rogueing of infected plants
• Disinfection of farming tools and equipment