Risk factors

The development of PVS infection results from a combination of: 

• different sources of infection, either internal (volunteers, seed tubers, weeds) and/or external (nearby potato crops, gardens, weeds);

• the relative significance of flights of aphids during the growing season (related to climatic conditions and nearby crops); 

• the level of control measures taken in seed potato production (roguing, crop management such as weed control, crop protection, haulm destruction, field and/or lot inspection and lab testing);

• the susceptibility of the potato cultivar.