Cottonwool Gall Wasp - Andricus quercusramuli
Andricus quercusramuli is a cynipid wasp that causes galls to form on English Oak and Sessile Oak.
Cottonwool galls are the sexual generation of Andricus quercusramuli
The asexual generation is a bud gall on oak.
There are several other bud galls formed by Andricus sp on oak
Sexual (cottonwool) gall 
Asexual (bud) gall 
Adult
On English Oak and Sessile Oak.
Galls from spring (cottonwool galls) to late summer (bud galls).
The spherical mass of white hairs hides up to 20 gall chambers, each about 2mm dia. and occupied by one larva. These mature and emerge in late June and following mating, the females then cause the alternate asexual generation galls in oak buds.
Occasional in England, though probably under recorded.
Scarce in Leicestershire and Rutland where there are only a handful of recent records.
Barbara Cooper
Long Clawson
23 May 2012
cottonwool gall - sexual generation on Oak
Barbara Cooper
Long Clawson
23 May 2012
cottonwool gall - sexual generation
Barbara Cooper
Long Clawson
23 May 2012
cottonwool gall - sexual generation
Leicestershire & Rutland Map
Enter a town or village to see local records
MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015
UK Map
Species profile
- Common names
- Cottonwool Gall
- Species group:
- Bees, Wasps, Ants
- Kingdom:
- Animalia
- Order:
- Hymenoptera
- Family:
- Cynipidae
- Records on NatureSpot:
- 1
- First record:
- 23/05/2012 (Cooper, Barbara)
- Last record:
- 23/05/2012 (Cooper, Barbara)
Total records by month
% of records within its species group
10km squares with records
The latest images and records displayed below include those awaiting verification checks so we cannot guarantee that every identification is correct. Once accepted, the record displays a green tick.
In the Latest Records section, click on the header to sort A-Z, and again to sort Z-A. Use the header boxes to filter the list.