Potato Viruses Y and A (PVY and PVA) is the second most important potato virus. It is perpetuated through infected tubers and transmitted by aphids in a nonpersistent manner. Potatoes yield losses may reach 80%.

Symptoms of Potato Viruses Y and A

Symptoms of Potato Viruses Y and A vary widely with virus strain,Potatoes  cultivar, and environmental conditions.
Rugosity, bunching, twisting of leaves, downward turning of leaflet margins, stunting, necrosis of leaflet veins, necrotic spotting, leaf necrosis, and stem streak are typical.
Less sensitive potatoes cultivars may react by developing with only a mild mosaic, or they may be infected symptomlessly.
PVA is in many respects similar to PVY.
When present in certain cultivars, it is generally less severe than PVY.
Potatoes yield losses may reach 40%.
PVA causes mosaic (sometimes severe), as well as rugosity and crinkling, and leaves may appear shiny.
PVA symptoms are usually milder, but cannot be easily distinguished from those of PVY.

Management

Management of PVY and PVA is by clonal selection and roguing in seed propagation. Resistant potatoes cultivars are available.

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