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Oak artichoke galls

Andricus foecundatrix


This gall is made by the parthenogenetic Cynipid gall wasp Andricus ffoecundatrix, which lays single eggs within leaf buds using their ovipositor and produce a chemically induced distortion of leaf axillary or terminal buds on Pedunculate Oak (Quercus robur). It can also affect to Sessile Oak (Quercus petraea) trees The larva lives inside a smaller hard casing inside the artichoke and this is released in autumn. The asexual wasp emerges in spring and lays her eggs in the oak catkins which will cause the formation of the 'hairy catkin galls', small oval galls which produce the sexual generation of wasps. A well grown specimen can be 2.0 cm long, dark green or russet, generally developing in June and reaching its full size before autumn.


Deciduous forest


Camera Model: NIKON D300. Exposure Time: 1/32 sec.; f/60; ISO Speed Rating: 800. Exposure Bias: 0 EV. Focal Length: 90.0 mm. Flash fired

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Spotted by

Pantón, Galicia, Spain

Spotted on Aug 13, 2013
Submitted on Oct 31, 2013

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