NS3977 : Acorn knopper galls on oak

taken 1 month ago, near to Renton, West Dunbartonshire, Great Britain

Acorn knopper galls on oak
Acorn knopper galls on oak
The galls are the red growths, gross distortions of some of the tree's acorns. This pedunculate oak tree was beside the path shown in NS3977 : A path in the industrial estate. The galls themselves are caused by the gall wasp species Andricus quercuscalicis.

Because of the life-cycle of the wasp, with one generation developing on pedunculate oak, and the other on turkey oak, the presence of this kind of gall here implies that there is at least one turkey oak tree nearby. Indeed, there is one, in the area shown to the right of the path in NS3977 : A path in the industrial estate, which was taken from about the same spot as the present picture.

[The wasp has two different generations: one develops on pedunculate oak; their offspring, slightly different, develop on turkey oak; their offspring, in turn, are of the first kind, back on pedunculate oak; and so on. Several other gall wasp species have a similar alternation of generations with different host plants.]
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NS3977, 308 images   (more nearby )
Photographer
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Date Taken
Friday, 16 August, 2019   (more nearby)
Submitted
Thursday, 22 August, 2019
Geographical Context
Paths 
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Subject Location
OSGB36: geotagged! NS 3991 7788 [10m precision]
WGS84: 55:58.0293N 4:33.9909W
Camera Location
OSGB36: geotagged! NS 3991 7788
View Direction
EAST (about 90 degrees)
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Plant Gall 

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