Oak Cherry Gall

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The Cherry Gall is caused by a tiny gall wasp, Cynips quercusfolii. It can be found on the underside of oak leaves, normally as a single gall. The grub remains in the gall after leaf-fall, emerging as an adult wasp in winter. This asexual generation will lay its eggs on the oak tree trunk which eventually mature to the sexual generation that mate and produce the more obvious galls.

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