Andricus kollari
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Andricus kollari, also known as the marble gall wasp, is a species of wasp which causes the formation of marble galls on oak trees. Synonyms for the species include Cynips kollari, Andricus quercusgem
Hymenoptera Cynipidae Andricus kollari 201408230042
Oak marble galls showing two stunted and two normal-sized examples
A developing oak marble gall
An oak apple gall; often confused with the oak marble gall: the brown areas are scale remnants from the bud.
Oak apple
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An oak apple or oak gall is a large, round, vaguely apple-like gall commonly found on many species of oak. Oak apples range in size from 2 to 4 centimetres in diameter and are caused by chemicals inje
Andricus kollari
…cerris), introduced into Britain in 1735, is required for the completion of the wasp's life cycle. The oak marble gall is frequently conflated with the oak apple gall, caused by another gall wasp, Biorhiza pallida. Oak marble galls are also known as the bullet gall, oak nut or Devonshire gall. The developing…
Oak apples on Quercus robur leaf
Oak galls on a Pyrenean oak (Quercus pyrenaica) in León, Spain.
An oak apple on an oak leaf.