Oak marble gall wasp
Enw gwyddonol: Andricus kollari
The oak marble gall wasp produces brown, marble-shaped growths, or 'galls', on oak twigs. Inside the gall, the larvae of the wasp feed on the host tissues, but cause little damage.
Gwybodaeth am rywogaethau
Ystadegau
Diameter of gall: up to 2cmStatws cadwraethol
Introduced species.