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Oak gall wasps


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Symtpoms
Odd structures develop on the foliage, buds, acorns and other parts of an oak tree, mainly in late summer but sometimes also in the spring.

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More than 30 species of gall wasps occur in Britain on the common oak, Quercus robur. Each species lays its eggs in a particular structure on the tree - the roots, bark, buds, leaves, catkins or acorns. The grubs feed on a nutritious layer of cells within the galls, where they eventually pupate and turn into adult wasps.

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