Potato Viruses

Potato viruses Common name Potato viruses Potato leaf roll virus (PLRV) Potato virus X Potato virus Y Potato virus A Potato virus S Potato virus M Alfalfa mosaic virus Causal agent There are a large number of potato viruses present. Among these, potato leaf roll virus, potato virus X, and potato virus Y are the most important. They are usually caused by means of aphids and contact with infected crops. Symptoms & Signs The symptoms vary, depending on the virus. Potato leaf roll virus initially turns the leaves pale and gives them a rolled appearance. It causes stunted growth of the plant, as well as chlorosis on leaves. The leaves may also turn leathery. Alternatively, potato viruses X and Y result in mosaic patterns or necrotic lesions on the plant. These viruses can interact with each other, producing a synergistic effect and amplifying the infection. Transmission The virus spreads through aphids that feed on the plant’s foliage. It can also transfer to healthy crops through contact with infected tubers. Time of concern Late spring to early summer Common hosts Potatoes Tomatoes Tobacco Pepper Eggplant