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Last update: May 2021

Identification of aphids associated with Fagaceae

Simplified keys are provided to help you identify frequent aphid species:

Visual identification: from photos
Identification key: based on morphological criteria

Visual identification

Lachnus roboris, Lachnus pallipes large aphid, dark brown, cornicles dark, reduced to a raised pore, alate with broad pigmented spots on wings
Myzocallis castanicola light yellow to intense yellow, alates with pigmented abdominal spots distributed in pairs
Phyllaphis fagi woolly beech aphid, colony covered with a mass of white woolly wax
Phylloxera spp small aphid orangey yellow, colonies often distributed in a circle on underside of leaves
Stomaphis quercus dark aphid, cornicles dark and reduced to a raised pore, characterized by very long rostrum		_{ici photo d'une autre espèce avec les mêmes caractéristiques : Stomaphis graffii inféodé aux Acer}
Thelaxes dryophila, Thelaxes suberi aphid brown or greenish with longitudinal line lighter, alate bears wings kept flat
Tuberculatus annulatus yellow or greenish aphid, cornicles short with length same as breadth, 3 pairs of dorsal tubercles, 3^rd pair distinctive in size and pigmentation
Tuberculatus borealis aphid yellow or greenish, cornicles short length same as breadth, presence of 4 pairs of corsal tubercles
Tuberculatus querceus aphid greenish to yellow, cornicles short and abdomen topped with a large dark bifid tubercle

Identification key

Sweet chestnut

	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

Beech

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 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

Oak

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