Woolly apple aphid
trees sheltering in cracks and under loose bark. The nymphs become active in late March or April (in the northern hemisphere) and around the end of May, large [...] Contrary to the situation in America, South Africa, and Australia, woolly aphid does not infest roots in Europe (except rarely if they occur above the ground) [...] General The woolly aphid, Eriosoma lanigerum , is a serious worldwide apple pest. It is probably of North American origin and has been distributed to other