Knopper Oak Gall Wasp - Andricus quercuscalicis
Alternative names
Knopper Oak Gall
Description
A Cynipid gall wasp that causes a gall to form on the acorns of various oaks. The gall is seen more often than the adult wasp.
Identification difficulty
Adult 
Gall 
Habitat
On Pendunculate Oak.
When to see it
May to July.
Life History
Knopper Galls develop as a chemically induced distortion of growing acorns on Pendunculate Oak trees, caused by cynipid gall wasp Andricus quercuscalicis which lays eggs within buds using the ovipositor.
UK Status
A recent introduction to the British Isles, first arriving in the 1960s and now found throughout England, Wales and as far north as Scotland.
VC55 Status
Common in Leicestershire and Rutland.
 on host (Quercus robur) Old Fosse Sapcote SP 4985 9222 (taken 7.8.2009)_gall.JPG)
Graham Calow
Sapcote
07 August 2009
on oak
Craig Mabbett
Wistow
13 February 2016
Knopper gall collected 13.2.2016
hatched 18.2.2016
David Nicholls
Bardon Hill
20 September 2013 on host Quercus robur Old Fosse Sapcote SP 4985 9222 (taken 14.8.2006)_gall.JPG)
Graham Calow
Sapcote
14 August 2006
gall on Oak
Ron.stevens
Broughton Astley Allotments
17 August 2016
David Gould
Narborough Bog
11 August 2017
 on host (Quercus robur) Old Fosse Sapcote SP 4985 9222 (taken 7.8.2009)_gall.JPG)
 on host Quercus robur Old Fosse Sapcote SP 4985 9222 (taken 14.8.2006)_gall.JPG)
Leicestershire & Rutland Map
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MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015
UK Map
Steve Mathers
Bagworth Heath Woods
22 August 2016
David Nicholls
Shady Lane Arboretum
22 September 2016
Alan Semper
Harby, Main St
22 August 2012
David Nicholls
Ullesthorpe Stewardship Farm
02 September 2011
Alan Semper
Harby churchyard
17 September 2015
Jonesboy1
croft
10 September 2015
steven lewis
welby
15 September 2015
Steve Mathers
Bradgate Park (around Bradgate House)
10 October 2016
cconway
Donisthorpe Woodland Park
13 August 2016
Craig Mabbett
Clump Hill Fields, Broughton Astley
03 October 2015
Knopper gall collected 3.10.2015 <br /> wasp hatched 11.2.2016
