This disease is known to all areas where the potatoes are planted.
This disease has different symptoms, depending on each potato species, the virus’ strain and the evolution of the climatic changes. The symptoms that are characteristic of this disease will be visible on the leaves, aerial stems and tubercles.
The attack on the leaves can be seen as a plain mosaic (yellow to green colored stains that alternate with the healthy, green-colored leaves) and as the disease evolves, the leaves can even become deformed and wrinkled. The final phase of this attack consists of the leaves having stains and necrotic stripes, that are brown to black. These necrotic stains and strikes can even emerge on the petioles and on the aerial stems.
The mosaic symptoms are more visible during the blossoming phase and as the temperatures grow, these become less visible. There are potato species which don’t have visible symptoms of this disease, but if serologically testing these plants, the infection will be confirmed.
The attack of this disease can also affect the tubercles and it will be noticeable as a shrinking in their size and weight.
The potato Virus X survives from one year to the following through the infected tubercles and during the vegetation period it is spread with the help of the mechanical contact between the healthy and infected plants, or through the hands and clothes of the crop workers, or the machines/tools that are used.
Prevention and control
We recommend planting resilient potato species, using healthy tubercles when sowing, taking out the infected plants from the crop and avoid wounding the plants throughout the maintenance procedures.