Potato virus Y

The causal agent of this disease is Potyvirus yituberosi, commonly known as Potato virus Y (PVY). It is a filamentous, single-stranded RNA virus that belongs to the Potyviridae family and is considered one of the most economically significant plant viruses worldwide.

This virus primarily infects crops within the Solanaceae family. Its main hosts are potatoes, tomatoes, peppers, and tobacco. In addition to cultivated plants, several weed species can host the virus, serving as latent reservoirs for the pathogen during the off-season.

Symptoms of the infection can range from mild mottling to severe necrosis, depending on the viral strain and the host cultivar. Common manifestations include mosaic patterns, leaf crinkling, stunting of the plant, and necrotic streaks on the leaves. Severe infections can lead to premature senescence of the foliage.

Transmission occurs primarily through aphid vectors in a non-persistent manner, meaning the aphids can acquire and transmit the virus in a matter of seconds. Mechanical transmission through infected machinery, tools, or physical contact between plants is also a major factor in the spread of the disease within agricultural fields.

The damage caused by Potyvirus yituberosi is highly significant, leading to severe yield losses and degradation of the quality of tubers. Because the virus accumulates in tubers, it severely impacts the seed potato industry, necessitating strict quality control to prevent the spread of the virus to new areas.

• Utilize high-quality, certified virus-free seed potatoes.
• Implement rigorous aphid control programs during the growing season.
• Apply spatial isolation from other Solanaceous crops.
• Rogueing: remove and destroy symptomatic plants promptly.
• Practice strict sanitation of tools and farm equipment.