Identification key for frequent aphids on Apiaceae

1 

Large aphid with cornicles long and straight (about 3mm)
  

——> 2

Small to medium-sized aphid (1-2mm)

——> 3

2

Apterous green or pink, elongate and large, antennae same length as body and 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 and piriform, antennae long, spot dark green at base of cornicles, cornicles light-coloured, straight with apical flange darkened at tip, cauda digitate;  alate without abdominal pigmentation, antennae and cornicles darkening towards the tip, cauda long and light-coloured
Aulacorthum solani

3

Apterous bluish green, slightly wax powdered, cornicles brownish distinctly shorter than cauda and curved inwards, cauda linguate; alate with dark transverse stripes between cornicles, which are very small and curved outwards
Semiaphis dauci
    

Apterous with cornicles straight, longer than cauda
    

——> 4

Apterous with cornicles swollen, longer than cauda 

——> 6

4

Apterous greyish yellow to greenish grey with reddish-brown area at base of  cornicles and covered with greyish powdery effect, cornicles straight and dark, small triangular cauda;  alate with dark discal patch, antennae with numerous rhinaria giving a rough aspect; complex of species which cannot be separated at the magnification used
Dysaphis apiifolia
Dysaphis crataegi
   

Apterous greenish yellow to dark olive green , without powderiness

——> 5

5

Apterous yellow green to apple green without any dorsal pigmentation, cornicles and cauda black, cauda elongate;  alate with marginal cornicular and post-cornicular sclerites circular and post-cornicular, cornicles and cauda black, cauda elongate;  species limited to southern regions Aphis spiraecola
     

Apterous dark olive green to almost black, with  intersegmentary sclerites, cornicles and cauda dark, cauda short and squat; alate with marginal post-cornicular sclerites, cornicles and cauda dark, cauda short and squat ; alate with marginal post-cornicular sclerites, cornicles and cauda dark, cauda short and squat Aphis lambersi

6

Apterousgreenish yellow to apple green, antennae short, supracaudal caudicle almost as long as cauda and may hide it, cornicles distinctly swollen; alate with a dorsal patch more or less pigmented which can be reduced to stripes, antennae short, cornicles pigmented and swollen, cauda pigmented and digitate
Cavariella aegopodii
   

Apterous without supracaudal caudicle 

——> 7

7

Apterous green to yellowish with pinkish individuals in the colony which are the future alates (nymphs), cornicles slightly swollen on inner side and darkened at tip;  alate with dorsal patch jagged and perforated and contour irregular, cornicles pigmented uniformly and slightly swollen, cauda pigmented and digitate
Myzus persicae
   

Apterousyellowish green, elongate with cornicles swollen, black and same length as cauda which is black, antennae and legs black; alate green with marginal sclerites and post-cornicular dark; antennae, legs, cornicles and cauda dark, cornicles swollen, cauda digitate; two species which cannot be distinguished at magnification used
Hyadaphis foeniculi
Hyadaphis passerinii