acorn gall wasp andricus quercuscalicis pedunculate oak quercus robur bavaria germany europe

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Acorn gall wasp, Andricus quercuscalicis, on acorn of a pedunculate oak, Quercus robur, Bavaria, Germany, Europe Royalty Free Stock Photo

Acorn gall wasp, Andricus quercuscalicis, on acorn of a pedunculate oak, Quercus robur, Bavaria, Germany, Europe

Gall wasps are insects that lay their eggs in plant tissue. This is where growths, known as Gqallen, develop. The larvae of the gall wasps grow in these growths. Most species of gall wasps occur in the Mediterranean region and on the Black Sea, there are no gall wasps in the tropics.