Apple, pear, quince, plum, chokecherry, hawthorn, dogwood, and grasses.
Egg - Shiny dark green, oval.
Immature - Initially dark green, becoming lighter green, up to 1.8 mm long.
Adult - Light green with a dark green stripe down the back, light coloured legs, 2 mm long (Fig. 2).
Overwintering eggs on upper twigs and branches hatch when buds open in the spring. There are several generations produced before winged adults appear and move to grasses and grains for the summer. In the fall, adults return to apples and produce a generation that lays overwintering eggs.
Inspect trees in the spring to identify the aphid species present.
Apple grain aphids are attacked by early season parasitic and predatory insects that will remain to feed upon later appearing, more damaging aphid pests.
Chemical control is rarely needed. They provide food for early-season predatory insects and parasites.