Harmandiola tremulae
Harmandiola tremulae is a gall midge whose larvae feed on Aspen causing galls to form on the upperside of the leaves. The galls are globose, 3 to 4 mm across with thick walls, glossy-red when mature but often turning black later. The opening to the gall is underside, and surrounded by a slightly protruding rim.
Several other species cause spherical galls on Aspen.
Gall 
Adult 
On Aspen (Populus tremulae).
The larval stage is from June to September.
The larva is orange-red.
Widespread, though little recorded in Britain.
Thought to be fairly frequent in Leicestershire and Rutland.
David Nicholls
Fosse Meadows
08 July 2011
galls on Aspen
Graham Calow
Fosse Meadows, Sharnford
08 July 2011
underside of leaf
Graham Calow
Fosse Meadows, Sharnford
08 July 2011
orangey red larva image by Maggie Frankum
Graham Calow
Fosse Meadows, Sharnford
08 July 2011
thick walled gall image by Maggie Frankum
Graham Calow
Sharnford, Fosse Meadows
26 July 2020
galls on Aspen
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Species profile
- Species group:
- Craneflies, Gnats & Midges
- Kingdom:
- Animalia
- Order:
- Diptera
- Family:
- Cecidomyiidae
- Records on NatureSpot:
- 8
- First record:
- 08/07/2011 (Calow, Graham)
- Last record:
- 01/06/2022 (lemmon, roy)
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Latest records
Graham Calow
Fosse Meadows, Sharnford
08 July 2011
Graham Calow
Sharnford, Fosse Meadows
26 July 2020
galls on Aspen
Graham Calow
Sharnford, Fosse Meadows
26 July 2020
galls on Aspen
sue
Martinshaw Wood, south of M1 by carpark entrance
02 September 2021
Melinda Bell
Groby,Martinshaw Wood
28 September 2020
younger gall paler. No visible larva inside
sue
Albert Village lake
30 August 2021
sue
Albert Village lake
30 August 2021
