Knopper gall on oak
Introduction
The photograph on this page of Knopper gall on oak by M J Richardson as part of the Geograph project.
The Geograph project started in 2005 with the aim of publishing, organising and preserving representative images for every square kilometre of Great Britain, Ireland and the Isle of Man.
There are currently over 7.5m images from over 14,400 individuals and you can help contribute to the project by visiting https://www.geograph.org.uk
Knopper gall on oak
Image: © M J Richardson Taken: 13 Aug 2009
A gall caused by a cynipid wasp [Andricus quercuscalicis]. Usually one or two galls can be seen at the side of the acorn, but these are completely obscuring the acorn. A relatively recent introduction to Britain, but now quite widespread. See Lairich Rig's image and detailed account Image
Images are licensed for reuse under creativecommons.org/licenses/by-sa/2.0
Image Location
Latitude
52.13474
Longitude
-0.454024