Common Spangle Galls and Cherry Galls on oak leaves

Autumn is a good time to look for plant galls in Wyre. The ball-shaped Cherry Galls are induced by the gall wasp Cynips quercusfolii and those of the Common Spangle Galls by another gall wasp Neuroterus quercusbaccarum. The adult gall wasps that emerge early the following spring are all females and go on to lay their eggs on the developing oak leaf buds. The galls that result are quite different, and from these the sexual generation of males and females emerge in late spring and early summer.

Common Spangle Galls and Cherry Galls on oak, Postensplain, 6 September 2017 Rosemary Winnall

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