Symptoms on foliage

Depending on the cultivar, the viral strain and the co-infection with other viruses, the symptoms caused by PVX range from complete latency, mild mosaic to severe mosaic and leaf distortion. Symptoms due to PVX infection occurring during the current season are often absent. Symptoms of secondary infections are more readily distinguished (photos 1 and 2) with the presence of mosaic symptoms limited by veins (photos 3 and 4), with no leaf distortion apart from some exceptions (photo 5); in general, symptoms are often latent or mild.

The symptoms can be seen more easily during the active growth of the plant and in weak sunlight.

Mixed PVX infections with other viruses generally cause severe crinkling or leaf drop streak symptoms.