Within plant distribution of Potato Virus Y in hairy nightshade (Solanum sarrachoides): An inoculum source affecting PVY aphid transmission

► Hairy nightshade as inoculum source of several PVY strains. ► Hairy nightshade affects PVY epidemiology in the potato pathosystem. ► PVYNTN reaches high titre levels in hairy nightshade and potato. ► PVY aphid vectors can acquire the virus from hairy nightshade or potato plants. ► Hairy nightshade increases transmission of PVYNTN by M. persicae and M. euphorbiae.