Le plant français de pomme de terre FNPPPT Semae

Potato virus S

PVS = Potato Virus S

Causative agent and transmission

Two types of virus S strain can be distinguished: the PVS° or ordinary strain, very widespread in Europe (Germany, Poland, central Europe) and the PVSA Andean strains, classified as quarantine parasites because they produce much more severe reactions.

The virus S can be very easily transmitted both by contact, by passing machinery, for example, as well as by aphids that depend on a non-persistent mode (such as virus Y). The most frequently mentioned carrier aphids are Aphis nasturtii and Myzus persicae.

Description of symptoms on crops

(clic on photos to enlarge)

The virus S generally causes weak (latent) and variable symptoms according to the variety and viral strain:

  • lightening of the foliage;
  • depression of the veins on the upper side of the leaves (roughness to the touch) (photo);
  • reduction in leaf size;
  • tips of the leaflets inclined downwards;
  • on very sensitive varieties : leaves with a bronze appearance, necrotic spots, smaller plants.


The virus S has little effect on yield and the control consists of:

  • Use of healthy seed potatoes;
  • Testing the prebasic seed potato.

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