Aphid key

Identification key for frequent aphids on Fabaceae

Identification based on morphological criteria, click on the name to access identification file

1

 - Small-sized aphid  (less than 2mm) → 2

 - Large-sized aphid (2-4mm) → 4

2

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

 - Apterous black or dark olive-green → 3

3

 Apterous matt, dark olive-green, colony including individuals (nymphs) showing waxy white stripes, cornicles straight black, cauda digitate and squat; alate with a small number of rhinaria (3- 8) aligned on segment III, never on IV, abdomen with broad stripes possibly becoming fused near cornicles; cornicles straight and black, cauda digitate, black
Aphis fabae

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

4

 - Apterous large, grand, uniform colouring pink or green with cornicles long and straight → 5

 - Apterous with another colour or cornicles swollen → 6

5

 - Apterous and alate green or pink with antennae longer than body, cornicles very fine and very long, cauda tapering, sabre-shaped, often rolled upwards
Acyrthosiphon pisum

 - Apterous and alate green or pink with antennae as long as body, cornicles long and light-coloured, slightly pigmented at tip about level with reticulation (visible under magnifying glass), cauda long and light-coloured
Macrosiphum euphorbiae

6

 - Apterous green or bluish green, head, thorax and appendages black, cornicles slightly swollen, cauda long and linguate;  alate with marginal and pre- and post-cornicular sclerites black
Megoura viciae

 - Apterous with abdomen glossy, green to yellowish green, piriform, with abdominal spot darker at base of cornicles, antennae dark at articulations, cornicles pale, straight, long with dark  flange at tip, ends of femurs and tibias dark;  alate with abdomen green showing transverse stripes dark and a spot at base of cornicles, antennae completely dark except base of segment III, cornicles and cauda like apterous
Aulacorthum solani

See visual  identification

Modification date: 14 May 2024 | Publication date: 18 September 2014 | By: Evelyne Turpeau, Maurice Hullé, Bernard Chaubet