RT Journal Article SR Electronic A1 Dědič, P. A1 Ptáček, J. A1 Horáčková, V. A1 Matoušek, V. A1 Čeřovská, N. A1 Filigarová, M. T1 Potato virus S (PVS): puzzling virus for potato breeders and seed producers JF Plant Protection Science YR 2002 VO 38 IS 11 SP 648 OP 651 DO 10.17221/10581-PPS UL https://pps.agriculturejournals.cz/artkey/pps-200211-0119.php AB In the framework of PVS eradication from breeding materials of Czech potato cultivars, the systematic research was devoted to: susceptibility of cultivars, occurrence of PVS in imported and domestic materials, and to maintenance of virus-free basic grades potatoes on breeding stations. In the field-exposure trials was proved high level of susceptibility of most cultivars to PVS and by contraries, gradualy increased proportion of maintained virus-free cultivars of foreign, as well as domestic origin. Nevertheless severe infestation still persist in some of them. The contemporary situation with maintenance of virus-free basic material in CR was demonstrated.