Ministry of Agriculture
Aphis pomi (DeGeer)
Colony of apple aphids on apple leaf
Apple twig infested with apple aphids
Life Cycle: Overwinter on host as black eggs that hatch near bud burst. Several generations are produced on host trees during the summer (females only). Winged males and females appear in late summer to mate and lay overwintering eggs.
Monitoring: Beginning late May to early June, examine shoot leaves for presence of aphids and beneficial insects. Young, non-bearing trees should also be inspected.
Hosts: Apple, pear, hawthorn, quince, pyracantha.
Comments: The spirea aphid (Aphis spireacola), identical to the apple aphid in appearance and life cycle, is becoming more common in many orchards. The spirea and apple aphid are bright green with black legs; the apple grain aphid is pale green with a darker green stripe and tan legs. The three aphids can appear together early in the season. The eggs of all species are oblong and shiny black in colour.
Body length: Adult - 2.0mm; Mature nymph - 1.8mm