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Cherry Gall Wasp

The Cherry Gall Wasp is a 3- to 4-mm-large brown-black gall wasp that causes the up to three-cm-sized galls on the underside of oak leaves.

recognize Cherry Gall Wasp
Cherry Gall Wasp, photo: Wofl - CC BY-SA 2.5
recognize larva Cherry Gall Wasp
Larva Cherry Gall Wasp in gall, photo: Rasbak - CC BY-SA 3.0

Cherry Gall Wasp (Cynips quercusfolii L.). A 3- to 4-mm-large brown-black gall wasp that causes the up to three-cm-sized galls on the undersides of oak leaves. The galls consist of proliferating mesophyll.
The female gall wasp deposits eggs on the veins of the underside of leaves in summer. The egg activates the leaf in making a gall. In the gall lives the larva that pupates in the fall. In winter, the Cherry Gall Wasp emerges from the pupa and eats its way out.

Where to find

Control

As a rule, control is not necessary.

Prevention

As a rule, not necessary.