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1

 - Aphid greyish and colonies covered with wax
Apterous greenish grey, globular, with a dense whitish waxy meal covering ; cornicles small dark and swollen (barrel-shaped); cauda short, triangular and dark;  alate with antennae and wing veins dark, abdomen with transverse stripes more or less  discontinuous in the middle
Brevicoryne brassicae

 - Aphid with another colour → 2

2

 - Large-sized aphid (about 3mm) → 3

 - Medium-sized aphid (about 2mm) → 4

3

 - Apterous green or pink, elongate, large-sized; antennae with length equal to body and slightly pigmented; cornicles long, cylindrical, darkening towards the tip; cauda long and light-coloured;  alate without abdominal pigmentation; antennae and cornicles darkening towards the tip; cauda long and light-coloured
Macrosiphum euphorbiae

 - Apterous green to yellowish green, glossy, piriform; antennae long; spot dark green at base of cornicles; cornicles light-coloured, straight, with flange darkened at end; cauda digitate; alate  with stripes more or less  dark on abdomen
Aulacorthum solani

4

 - Apterous olive green to dirty yellow with presence of wax patches; antennae short; cornicles slightly pigmented, sausage-shaped; cauda short, digitate and pigmented; alate with presence of some flecks or interrupted stripes on abdomen  and marginal sclerites
Lipaphis erysimi

 - Apterous with no wax patches or spots → 5

5

 - Apterous olive-tinged, dirty yellow or slightly pinkish with abdomen bulging; antennae long, fine and arcuate;  cornicles swollen; cauda small and triangular; alate dark with a dorsal patch and wings smudged
Myzus ascalonicus

 - Apterous green to yellowish, colony including some pinkish individuals that are the future alates (nymphs); antennae straight; cornicles slightly swollen on inner side ; cornicles slightly swollen on inner side ; alate with a dorsal patch jagged and perforated
Myzus persicae

See visual identification