Blister galls on walnut
Introduction
The photograph on this page of Blister galls on walnut by Evelyn Simak 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
Blister galls on walnut
Image: © Evelyn Simak Taken: 19 Aug 2017
These galls are caused by the gall mite Aceria erinea. Large yellowish blisters > http://www.geograph.org.uk/photo/5504906 appear on the upper surface of the leaves. On the underside the galls show as hollows > http://www.geograph.org.uk/photo/5504907 which are lined with grey or pale brown hairs among which the mites live and feed.
Images are licensed for reuse under creativecommons.org/licenses/by-sa/2.0
Image Location
Latitude
52.608737
Longitude
1.413724