''Dryocosmus'' are a genus of

gall wasp Gall wasps, also traditionally called gallflies, are hymenopterans of the family Cynipidae in the wasp superfamily Cynipoidea. Their common name comes from the galls they induce on plants for larval development. About 1,300 species of this gene ...

s. They are cyclically

parthenogenetic Parthenogenesis (; from the Greek + ) is a natural form of asexual reproduction in which the embryo develops directly from an egg without need for fertilization. In animals, parthenogenesis means the development of an embryo from an unfertiliz ...

insects that induce

gall Galls (from the Latin , 'oak-apple') or ''cecidia'' (from the Greek , anything gushing out) 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 war ...

s on plants in the family

Fagaceae The Fagaceae (; ) are a family of flowering plants that includes beeches, chestnuts and oaks, and comprises eight genera with around 1,000 or more species. Fagaceae in temperate regions are mostly deciduous, whereas in the tropics, many species ...

. According to recent studies, the genus includes some species previously considered as belonging to the genus '' Chilaspis'', whereas '' Dryocosmus favus'' should be excluded of the genus. ''Dryocosmus'' and ''Chilaspis'' are closely related to the other oak gall wasp taxa (''

Aphelonyx ''Aphelonyx'' is a genus of oak gall wasps in the family Cynipidae Gall wasps, also wikt:gallfly#Usage notes, traditionally called gallflies, are hymenopterans of the family Cynipidae in the wasp superfamily Cynipoidea. Their common name com ...

'', '' Plagiotrochus'', '' Pseudoneuroterus'', '' Trichagalma'', and some ''

Neuroterus ''Neuroterus'' is a genus of gall wasps that induce galls on oaks in which the wasp larvae live and feed. Some species produce galls that fall off the host plant and 'jump' along the ground due to the movement of the larvae within. ''Neuroteru ...

'' species) ''

Dryocosmus kuriphilus ''Dryocosmus kuriphilus'' is a species of gall wasp known by the common names chestnut gall wasp, Oriental chestnut gall wasp, and Asian chestnut gall wasp. It is native to China and it is known in many other parts of the world, particularly the ...

'' is an

invasive species An invasive species is an introduced species that harms its new environment. Invasive species adversely affect habitats and bioregions, causing ecological, environmental, and/or economic damage. The term can also be used for native spec ...

in Europe and North America (originating from Asia) that endangers the

chestnut The chestnuts are the deciduous trees and shrubs in the genus ''Castanea'', in the beech family Fagaceae. The name also refers to the edible nuts they produce. They are native to temperate regions of the Northern Hemisphere. Description ...

trees.L.K.Rieske, Success of an exotic gallmaker, Dryocosmus kuriphilus, on chestnut in the USA: a historical account, EPPO Bulletin 37 (1), 172–174 (2007)

Species

* '' Dryocosmus archboldi'' Melika & Abrahamson, 2021 * '' Dryocosmus asymmetricus'' (split twig gall wasp) * '' Dryocosmus castanopsidis'' (Chinquapin flower gall wasp) * '' Dryocosmus caspiensis'' * '' Dryocosmus cerriphilus'' * '' Dryocosmus deciduus'' * '' Dryocosmus dubiosus'' (two-horned gall wasp) * '' Dryocosmus floridensis'' * '' Dryocosmus imbricariae'' (banded bullet gall wasp) * '' Dryocosmus israeli'' * '' Dryocosmus jungalii'' * ''

'' Yasumatsu, 1951 * '' Dryocosmus mayri'' * '' Dryocosmus mikoi'' * '' Dryocosmus minusculus'' (pumpkin gall wasp) * '' Dryocosmus nervosus'' * '' Dryocosmus nitidus'' * '' Dryocosmus quercuspalustris'' (Osten Sacken, 1861) (succulent oak gall wasp) * '' Dryocosmus rileyi''

References

Cynipidae Hymenoptera genera Gall-inducing insects {{apocrita-stub