elupuu okkaid imevad suured lehetäid, kes eritavad mesikastet, millel lööbivad tahmkatteseened, kahjustatud okkad pruunistuvad, damage is often caused to nursery stock; hedges, and specimen trees, in parks and gardens are also affected, the aphids, witch excrete considerable quantities of honeydew, feed on the foliage, shoots and branches, they cause discoloration and die-back of affected tissue, whith reduces plant vigour