Andricus inflator
The cynipid gall wasp Andricus inflator causes galls to occur on various species of oak.
Agamic galls are quite large (up to 6mm diameter), and are spherical or with a small point. Bud scales are present at the base of the gall, but may drop off old galls
Sexual galls are in twigs, and are hard and woody, causing knobbly swellings, which can persist for some time after being vacated. Inside is a long narrow larval chamber. To distinguish from other twig galls, it may be necessary to open the gall.
Similar galls in oak buds are formed by other Andricus species
Similar galls in twigs are formed by the agamic Andricus curvator. This has a small spherical inner gall
Asexual/sexual galls 
Adult
Where oak is present.
When oak is in leaf.
Widespread but not well recorded in Britain.
Status in Leicestershire and Rutland not known.
Annie Smith
Charnwood Lodge
12 September 2019
agamic gall on Oak
sue
Heather, Swepstone Rd opposite The Cattows
26 August 2023
sexual gall creating swollen twig
sue
Ratby, new plantation
02 September 2021
agamic gall on oak
sue
Ratby, new plantation
adj to Martinshaw Wood, south of M1
02 September 2021
section through agamic gall on oak
David Nicholls
Bagworth Heath Woods
24 February 2022
sexual gall on oak
David Nicholls
Bagworth Heath Woods
24 February 2022
Annie Smith
Charnwood Lodge
12 September 2019
gall on Oak
Annie Smith
Charnwood Lodge
12 September 2019
gall on Oak
sue
Heather, glade in plantation south of Swepstone Rd oppsite The Cattows
26 August 2023
galls drop off leaving scar inside remains of bud
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
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UK Map
Species profile
- Species group:
- Bees, Wasps, Ants
- Kingdom:
- Animalia
- Order:
- Hymenoptera
- Family:
- Cynipidae
- Records on NatureSpot:
- 10
- First record:
- 09/09/2018 (Bennett, Simon)
- Last record:
- 22/09/2023 (Bell, Melinda)
Total records by month
% of records within its species group
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Latest records
David Nicholls
Bagworth Heath Woods
24 February 2022
sexual gall, larva inside cavity
sue
Loughborough, Deans Lane alongside Martin's Wood
23 August 2023
sue
Heather, glade in plantation south of Swepstone Rd oppsite The Cattows
26 August 2023
asexual gall on oak
sue
Loughborough, Deans Lane alongside Martin's Wood
23 August 2023
