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gall wasps

Approximately 1,400 species large family of Hymenoptera. The vast majority of them are predatory parasitoids (live of host animals) and are with it beneficials in viticulture, the rest of vegetable tissue and so on Vine enemies, The mostly 1 to 3 and in some species to 8 mm large, winged insects have no wasp waist and are black, brown or yellow colored. Through the deposited eggs and the larvae hatched from the eponymous Gallen depending on insect species on leaves, buds, stems, flowers and roots formed. The individual species are specialized in certain host plants. By far the most common leaves are attacked by oak trees, because there are only a thousand different oak gall wasps (picture right). At the Rebstock they occur only to a relatively small extent. See also below wasps,

Gallwesoen - Andricus coriarius and Cynips Quercus quercusfolii (Eichengall wasp)

Picture left: By Fritz Geller-Grimm - Own work, CC BY-SA 3.0 , Link
Picture right: CC BY-SA 2.5 , Link

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