Potatoes are an important crop in Mediterranean countries both for local consumption and for export to other countries, mainly during the winter. Many Mediterranean countries import certified seed potato in addition to their own seed production. The local seeds are mainly used for planting in the autumn and winter, while the imported seed are used for early and late spring plantings. Potato virus Y is the most important virus in Mediterranean countries, present mainly in the autumn plantings. The second important virus is Potato leafroll virus, though in recent years its importance seems to be decreasing. Potato virus X, Potato virus A, Potato virus S, Potato virus M, and the viroid, Potato spindle tuber viroid, were also recorded in several Mediterranean countries. For each virus the main strains, transmission, characterization of the virus particle, its genome organization, detection, and control methods including transgenic approaches will be discussed.
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