species (Solanum spp.) growing in five Andean countries and 1 from Scotland differed in
virulence depending on isolate and host species. Nine isolates infected Chenopodium
quinoa systemically but two others and the Scottish isolate remained restricted to inoculated
leaves; therefore, they belonged to biologically defined strains PVSA and PVSO,
respectively. When nine wild potato species were inoculated, most developed symptomless …