There are often a symbiotic relationship between ants and aphids, where the ants protects the aphids against predators for the return of food (honeydew). By disrupting this relationship, it is often possible to ensure the aphids get wiped out by parasitoids and other predators. To do this, a rubberband or ducktape around the stem of the fruit tree will prevent the ants for moving further up, and thereby leave the aphids vulnerable.