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Viruses occurring in Serbia and other countries in the region are a huge  problem constraining seed potato production. At lower altitudes, in lowland  and hilly regions, where table potato production is widely distributed, more  than 50% of healthy plants become infected with potato virus Y during one  growing season. Under these conditions, seed potato production is hindered  due to a high infection pressure of potato virus Y which spreads far more  rapidly compared to leaf roll virus, virus S and other viruses hosted by this  plant species. This study tended to clarify a frequent dilemma regarding the  use of insecticides in preventing the infection of healthy plants with potato  virus Y and leaf roll virus, given the oral and written recommendations from  pesticide manufacturers, agronomists and scientists in the field of crop  protection arising from a logical conclusion that aphid vector control  results in virus transmission control. The present findings, which are in  agreement with reports of authors from other countries, show that the use of  insecticides is ineffective in preventing potato virus Y which is  nonpersistently transmitted by aphids from an external source of infection.  However, insecticides can exhibit efficacy in preventing potato virus Y  transmission from infected plants to healthy plants within a crop, which can  have an overall positive effect only if seed potato is grown in areas that  have no external source of infection. The present results and those of other  authors show that insecticides are effective in preventing the infection of  healthy plants with persistently transmitted leaf roll virus. Mineral oils  provide effective control of potato virus Y by preventing the infection of  potato plants with the virus. They can be combined with other management  practices to protect seed potato crops against the virus. Given the fact that  the initial first-year infection of healthy potato plants with virus Y in  relation to leaf roll virus is approximately 10-20:1 under conditions in  Serbia, and that the use of insecticides fails to ensure protection against  PVY, this practice cannot have any positive effect on virus control under  high infection pressure conditions.

Potential use of insecticides and mineral oils for the control of transmission of major aphid-transmitted potato viruses