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Large aphid (more than 3.5 mm), dark brown, living on branches
Apterous with antennae short, cauda shorter, cornicles short reduced to a raised pore;  alate with broad pigmented spots on forewing membrane
Lachnus roboris

Smaller aphid, light to intense yellow, living at surface of leaves or on young shoots; all the adults are winged and characterized by pigmented abdominal spots 
Larva and nymph yellow, abdomen with pigmented spots topped with long capitate hairs; cornicles small, cauda knobbed and anal patch bilobed; alate with dark dorsal spots distributed in pairs and marginal sclerites distinctly pigmented; head and thorax marked with a dark longitudinal medial stripe, cornicles small, dark, wing veins with ends pigmented
Myzocallis castanicola

Apterous with antennae short, cauda shorter; cornicles short and reduced to a raised pore; alate with broad pigmented spots on forewing membrane
Lachnus pallipes

Green to pale yellow aphid, in colony covered with white woolly wax 
Apterous with elongate shape, antennae shorter than body, cornicles pore-like; alate pale with or without slight marks, antennae same length as body with processus terminalis very short, cornicles pore-like, cauda knobbed
Phyllaphis fagi

1

Large aphid (more than 3.5 mm), dark brown, living on branches
Apterous with antennae short, cauda shorter, cornicles short and reduced to a raised pore; alate with broad pigmented spots on forewing membrane
Lachnus roboris or L.pallipes

Smaller aphid

---> 2     

2

Chestnut or greenish aphid, flattened, with abdomen showing lighter-coloured longitudinal line 

Apterous with antennae short, consisting of 5 segments: cornicles reduced to a pore, cauda knobbed; alate shows antennae with 5 segments; hind part of abdomen with pigmented stripes, cornicles encircled with brown ring, cauda knobbed, wings kept flat with  medial vein only once-branched and wing veins strongly marked
Thelaxes dryophila

Wingless aphid with different uniform colour (green, yellow or orangey)

---> 3    

3

Tiny aphid (0.7-0.85 mm) orangey yellow, colonies often organized in a circle on the underside of leaves
Apterous with head and thorax globular followed by a triangular abdomen, genus characterized by 3 antennal segments, no cornicles, nor cauda; alate triangular, 3 antennal segments, neither cornicles nor cauda
Phylloxera spp

Medium-sized aphid, green or yellow, all adults winged

---> 4

4

Light to deep yellow aphid, characterized by pigmented abdominal spots distributed in pairs
Larva and nymph yellow, abdomen bears pigmented spots topped with long capitate hairs, small cornicles, cauda knobbed and bilobed anal patch; alate with dark dorsal spots distributed in pairs and pigmented marginal sclerites; head and thorax marked with a dark longitudinal medial stripe, cornicles dark, wing veins with ends pigmented
Myzocallis castanicola

Green to greenish aphid, or uniform yellowish 

---> 5

5

Larva and nymph green or yellow, antennae dark brownish at articular sutures; alate with antennae dark brownish at articular sutures, abdomen characterized by the presence of 3 pairs of tubercles, 3^rd pair larger and pigmented, cornicles short and black on distal half, cauda knobbed on a bilobed anal patch Tuberculatus annulatus

Larva and nymph green or yellow, antennae dark brownish at articular sutures; alate with antennae dark brownish at articular sutures, abdomen characterized by presence of 4 pairs of tubercles (first 3 pairs of same size and 4^th pair often smaller), cornicles short with tip black, cauda knobbed on bilobed anal patch
 Tuberculatus borealis