Knopper Oak Gall Wasp - Andricus quercuscalicis
Alt Name
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.
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 CalowSapcote07 August 2009on oak
Craig MabbettWistow13 February 2016Knopper gall collected 13.2.2016 <br /> hatched 18.2.2016
David NichollsBardon Hill20 September 2013 on host Quercus robur Old Fosse Sapcote SP 4985 9222 (taken 14.8.2006)_gall.JPG)
Graham CalowSapcote14 August 2006Knopper Oak Gall on acorns of Pendunculate Oak
Ron.stevensBroughton Astley Allotments17 August 2016
David GouldNarborough Bog11 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
Enter a town or village to see local records
UK Map
Steve MathersBagworth Heath Woods22 August 2016
David NichollsShady Lane Arboretum22 September 2016
Alan SemperHarby, Main St22 August 2012
David NichollsUllesthorpe Stewardship Farm02 September 2011
Alan SemperHarby churchyard17 September 2015
Jonesboy1croft10 September 2015
steven lewiswelby15 September 2015
Steve MathersBradgate Park (around Bradgate House)10 October 2016
cconwayDonisthorpe Woodland Park13 August 2016
Craig MabbettClump Hill Fields, Broughton Astley03 October 2015Knopper gall collected 3.10.2015 <br /> wasp hatched 11.2.2016
