Results of spreading ability of main aphid species in potato crop in three location of the country North, South and Central part show that the best phitosanitary condition for seed production a in the north part of the country where the temperature and aphids fl ight is lower. The vectors pressue is not dependent only on the abundance of aphids but on the species structure and the dynamics of fl ight too. In the second crop production aphids pressure is two times lower. When the fl ight of species with transmission effi ciency begins earlier the virus spreading is stronger as a result of the fact that the younger plants are more susceptible to infections. Dates about mobility capacity of the main aphid species of viruses transmission in potato crop constitutes a basic element of the integrated potato pest control. Isolation of the seed potato fi eld from viruses source, elimination of infected plants, aphids control by chemicals haulm killing according aphids pressure, storage of the seeds in controlled conditions permit to obtain a relative good quality of the seeds in local condition.