Waxy willow aphid
Plocamaphis flocculosa
The Waxy willow aphid (Plocamaphis flocculosa) is a fairly large species of aphid (3.1-5.1mm) that lives unattended by ants on various species of Salix in North-West and North Europe and North America. It does not switch hosts, so the entire cycle can be completed on the same tree.