Identification key for frequent aphids on Liliaceae

1

 - Apterous green to bluish green with elongate shape; antennae short; cornicles tiny; cauda long and digitate; alate without dorsal pigmentation;  cornicles and cauda like apterous form; on asparagus
Brachycorynella asparagi

 - Apterous with cornicles straight or swollen on asparagus or other Liliaceae → 2

2

 - Apterous with cornicles swollen → 3

 - Apterous with cornicles straight → 5

3

 - Apterous dark red to black; cornicles swollen, lighter-coloured than abdomen; alate very dark to black; wing venation with broad brown edging 
Neotoxoptera formosana

 - Apterous with different colours → 4

4

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

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

5

 - Apterous with cornicles straight, short to medium length → 6

 - Apterous with cornicles straight and long → 10

6

 - Apterous light-coloured, yellowish to greenish yellow → 7 

 - Apterous darker, olive-tinged green to black → 8

7

 - Apterous yellowish; abdomen bearing pigmented spots between each segment; antennae equal to half the length of body; cauda triangular, linguate; alate with dorsal patch roughly square possibly interrupted; antennae equal to half length of body; cornicles slightly pigmented; cauda short, triangular
Myzus ornatus

 - Apterous yellowish white; abdomen with a horseshoe-shaped spot; cornicles straight with flange at tip; cauda digitate; alate with dorsal patch; antennae dark; cornicles straight and dark with flange; cauda digitate, dark
Aulacorthum (Neomyzus) circumflexum

8

 - Apterous olive green to brownish; cornicles black uniformly pigmented, darker than cauda; alate with marginal and post-cornicular sclerites strongly darkened; cornicles dark; cauda slightly lighter than cornicle
Aphis frangulae or Aphis gossypii (*)

 - Apterous black, matt or glossy → 9

9

 - Apterous matt black to dark olive green with colony including future alates (nymphs) showing waxy white stripes; cornicles straight and black; cauda digitate and squat alate with pigmented stripes with contour irregular on abdomen
Aphis fabae

 - Apterous black, glossy; pigmentation variable in extent; cornicles straight, black and slightly conical; cauda black; alate with small number of rhinaria (3-8) aligned on segment III, never on IV; abdomen with broad stripes possibly fusing near cornicles; cornicles straight and black; cauda digitate and black
Aphis craccivora

10

 - Apterous green or pink, elongate and large-sized; antennae with length equal to body, slightly pigmented; cornicles long, cylindrical and 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; dark green spot at base of cornicles; cornicles light-coloured, straight with dark flange at end; cauda digitate; alate with stripes more or less  dark on abdomen
Aulacorthum solani

See visual identification