Identification key for frequent aphids on Grossulariaceae

 1

 - Small-sized aphid and antennae shorter or equal to half the length of the body → 2

 - Small- medium-sized aphid with antennae longer than half length of the body → 3

2

 - Two species morphologically very close but which have different hosts 

 - Apterous greyish green, with antennae, cornicles and legs pale, antennae short (less than half the length of the body) and pigmented at tip, cornicles short, cauda digitate and slightly pigmented; alate dark, antennae short, abdomen with large marginal and post-cornicular sclerites , cornicles short and dark, cauda digitate  and slightly pigmented
Aphis grossulariae on Ribes uva-crispa (gooseberry)

3

 - Aphid with cornicles straight → 4

 - Aphid with cornicles swollen → 5

4

 - Apterous whitish to yellowish, presence of long capitate hairs on abdomen  and head, antennae longer than body, cornicles straight, long and almost transparent, cauda short, rounded; alate yellowish with abdominal patch notched, antennae longer than body with numerous rhinaria; cornicles long, slightly pigmented, cauda short
Cryptomyzus ribis

 - Apterous yellow to greenish, antennae same length as body with processus terminalis very long, abdomen with a series of dorsal stripes weakly pigmented, cornicles cylindrical, light-coloured at tip darkened, cauda digitate, light-coloured ; alate with antennae long and black finishing in long processus terminalis, abdomen with segmented stripes which may join up to form a very jagged patch, marginal and post-cornicular sclerites present, cornicles cylindrical and dark, cauda digitate, dark, legs darkened at articulations
Nasonovia ribisnigri

5

 - Apterous whitish to yellowish with green longitudinal line, antennae very light-coloured with length greater than that of the body, cornicles fine and slightly swollen on distal 1/3; alate with a patch  strongly incised, antennae long and dark, cornicles slightly swollen and pigmented, cauda digitate
Cryptomyzus galeopsidis

 - Apterous yellowish green, glossy, cornicles quite strongly swollen in middle; alate green with abdominal patch dark and with contour irregular, antennae long and dark, cornicles swollen and slightly pigmented, cauda pale, articulations of legs dark
Hyperomyzus lactucae

See visual identification