Andricus quercuscalicis
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Andricus quercuscalicis is a gall wasp species inducing knopper galls.
Andricus quercuscalicis Quercus robur 02
Galls (upper left and right) formed on acorns on the branch of a pedunculate (or English) oak tree by the parthenogenetic generation Andricus quercuscalicis.
A larva of Andricus quercuscalicis in a gall formed in Quercus robur
Gall
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Galls or cecidia are a kind of swelling growth on the external tissues of plants. Plant galls are abnormal outgrowths of plant tissues, similar to benign tumors or warts in animals. They can be caused
Andricus quercuscalicis
…induced distortion of growing acorns on pedunculate oak (Quercus robur L.) trees, caused by gall wasps, which lay eggs in buds with their ovipositor. The gall thus produced can greatly reduce the fecundity of the oak host, making this gall potentially more of a threat to the reproductive ability of the tree…
Cola-nut galls (Andricus lignicola) on pedunculate oak, caused by a cynipid gall wasp
Oak artichoke gall caused by Andricus foecundatrix
Artichoke gall cut open to reveal wasp larva