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The virus X causes mosaic-type symptoms on potatoes.
Transmission of virus X to the plant occurs :
• mainly mechanically, through contact between the plants subjected to friction (wind, machines, humans, animals, etc). In practice, most contamination occurs mechanically due to the passage of machinery.
• to a letter degree, by insects when they attack the plant.
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It is not easy to distinguish symptoms that are due to contamination during the current year; clear expression only occurs when infection takes place in the previous year : the appearance of mosaics is limited by the veins, without deformation of the foliage, apart from some exceptions, and is latent in a large number of cases.
The symptoms can be seen more easily during the plant's active growth phase and in weak sunlight.
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