oak leaf with gall of oak gall wasp

balls branch button cerroneuroterus cynipidae cynipini dye education egg fagaceae gall hymenoptera insects lanuginosus larva lay leaf lobed loose medicine natural nature nut oak outgrowth overgrowth parasitic pathological pest plant porous puddle quercus resemblance robur round safe season shape shelter soft structure substance tanning tree veins wart wasp yellow