Common on apple and pear , it also develops on olive , plum , apricot and walnut . There is 1 generation per year. Eggs overwinter under the female's scale and hatch from May onwards. Young nymphs are initially mobile but settle on the twigs and branches 2 to 3 days after natching. After 2 moults , they become females in June and July.
Females reproduce parthenogenetically in the autumn.
Each lays 40 to 80 eggs and then dies, the eggs overwintering under the scale. Colony of female individuals on apple Scales protect eggs during the winter. . Damage on olive Fruits are covered with scales. .