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Photo: G. Bradley |
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UK
Safari Tip:
To help you identify the most frequently found galls there's a
fully illustrated fold out chart in the Nature Shop - click
here
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Knopper galls are created by the gall wasp Andricus quercuscalicis. They are common throughout England and Wales, and appear on the acorns of the oak tree.
Some years they have a bad effect on the acorn crop. The trees most affected are generally in close proximity to Turkey Oaks.
 The wasps
which emerge from these galls in the springtime are all females. You can see
this wasp magnified 30 times here
They make their way to Turkey oaks, an introduced species in Britain, where they lay their eggs on the catkins. From these eggs both males and females hatch to lay the eggs that will produce the knopper galls.
UK Safari Galls Section
UK Safari Plants and Trees Section
UK Safari Creepy-Crawlies Section
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