Stem-gall
Guides
Andricus chrysolepidicola
Irregular Spindle Gall Wasp, irregular-spindle gall wasp
Andricus chrysolepidicola is a cynipid gall wasp that induces distinctive stem galls on several oak species in western North America. The species exhibits a complex heteroecious life cycle with alternating generations: first-year unisexual wasps produce irregular spindle-shaped stem galls, while second-year bisexual wasps induce bud galls. The species is primarily documented from California but has been recorded elsewhere along the Pacific coast and eastward to Nevada.
Andricus vacciniifoliae
Golden Oak Apple Gall Wasp, Golden Oak Apple Wasp
Andricus vacciniifoliae is a gall-forming cynipid wasp native to the west coast of North America. The species creates distinctive stem galls on huckleberry oak (Quercus vacciniifolia) and canyon live oak (Quercus chrysolepis). The galls are colorful and fruit-like in appearance, often leading to misidentification as actual fruit. The wasp has been reclassified from Andricus to Trichoteras in some taxonomic treatments, though both names remain in use.
Antistrophus
rosinweed stem gall wasp
An undescribed species of cynipid gall wasp in the genus Antistrophus that induces distinctive stem-cluster galls on Silphium perfoliatum (cup plant). Like other Antistrophus species, it likely produces only female wasps through parthenogenesis, with adults emerging in fall to lay eggs in host plant stems. The galls provide shelter and food for developing larvae.
Antistrophus jeanae
Antistrophus jeanae is a gall wasp in the family Cynipidae, described in 2004 by Tooker and Hanks. Like other members of the genus Antistrophus, this species is likely associated with specific host plants in the Asteraceae family, though detailed natural history information remains limited. The species is known from a small number of observations, suggesting it may be relatively rare or underreported. It belongs to a genus characterized by stem-galling habits on composite plants.
Antistrophus laciniatus
Antistrophus laciniatus is a gall wasp in the family Cynipidae that induces stem galls on Silphium integrifolium (wholeleaf rosinweed), a prairie plant in the Asteraceae. The species was described by Gillette in 1891 and is one of several Antistrophus species associated with Silphium hosts. New host plant and distribution records have been documented in recent years.
Antistrophus pisum
Antistrophus pisum is a species of gall wasp in the family Cynipidae. It is a synonym of Antistrophus lygodesmiaepisum, a monophagous cynipid wasp that induces pea-like stem galls on the rush skeletonplant (Lygodesmia juncea). The species occurs in the Loess Hills region of western Iowa and extreme northwestern Missouri, where its host plant persists as a hypsithermal relict in hilltop prairie remnants. The galls are solid, succulent structures that exude latex-like sap when damaged.
Antistrophus silphii
Apical Rosinweed Gall Wasp
Antistrophus silphii is a gall-forming cynipid wasp native to North American prairies. The species induces stem galls on rosinweed (Silphium integrifolium), a tall prairie forb. Galls are large, solid, and succulent when young, becoming harder with age. The wasp has a single generation per year, with adults emerging in early summer.
Asphondylia atriplicis
Tumor Stem Gall Midge
Asphondylia atriplicis is a gall midge in the family Cecidomyiidae that induces distinctive tumor-like stem galls on plants in the genus Atriplex (saltbushes). Like other Asphondylia species, the adult female deposits eggs into host plant tissue, and the developing larva stimulates the plant to form a protective gall structure that provides both shelter and nutrition. The specific epithet 'atriplicis' indicates its association with Atriplex hosts. The genus Asphondylia is notable for inducing galls on diverse plant families and for often harboring symbiotic fungi that may assist in gall formation or nutrition.
Asphondylia auripila
Large Creosote Gall Midge
Asphondylia auripila is a gall midge in the family Cecidomyiidae that induces stem galls on creosote bush (Larrea tridentata). It is part of a species group of 15 closely related Asphondylia species that have partitioned creosote bush ecologically, with different species inhabiting leaves, stems, buds, and flowers. A. auripila specifically occupies the stems, forming distinctive pom-pom-like galls. The larvae develop within these plant-generated structures, which provide both shelter and nutrition.
Asphondylia floccosa
woolly stem gall midge, Saltbush Woolly Stem Gall Midge
Asphondylia floccosa is a gall midge in the family Cecidomyiidae that induces distinctive woolly stem galls on Atriplex polycarpa. The larvae develop within multi-chambered galls but do not consume plant tissue directly—instead feeding on fungi that grow inside the gall structure. This species was first described by Raymond Gagne in 1986 and is known from the southwestern United States.
Asphondylia helianthiglobulus
Sunflower Purse Gall Midge
Asphondylia helianthiglobulus is a gall midge species in the family Cecidomyiidae. Its larvae induce distinctive globular stem galls on several sunflower species in eastern North America. The specific epithet "helianthiglobulus" references both its host genus Helianthus and the rounded shape of the galls it produces. This species exemplifies the intimate plant-insect relationships characteristic of gall midges, where larval development occurs entirely within plant tissue.
Bucculatrix simulans
Bucculatrix simulans is a small ribbed cocoon-making moth in the family Bucculatricidae, described by Annette Frances Braun in 1963. It occurs in central North America from Texas northward to Iowa and east to Ohio. Adults are active primarily from January through July, with a wingspan of 9.5–10 mm. The larvae are known to feed on Helianthus (sunflower) species and create distinctive stem galls.
Burnettweldia washingtonensis
fuzzy gall wasp
Burnettweldia washingtonensis is a cynipid gall wasp that induces distinctive stem galls on white oaks (Quercus sect. Quercus) along the Pacific coast of North America. The species was originally described as Cynips washingtonensis in 1894 and later transferred to Disholcaspis before its current placement in Burnettweldia. It is locally common and among the more frequently observed oak gall wasps in its range, with over 1,400 citizen science records.
Callirhytis perdens
Ruptured Twig Gall Wasp
Callirhytis perdens is a gall wasp in the family Cynipidae that induces distinctive stem galls on several oak species in California. Unlike many gall wasps where larvae develop entirely within attached galls, this species exhibits a unique life history where mature larval capsules are expelled from fissures in the gall and complete development on the ground. The species was formerly classified under the genus Andricus. It is considered locally abundant within its restricted range.
Callirhytis quercusbatatoides
Southern Live Oak Stem Gall Wasp
Callirhytis quercusbatatoides is a cynipid gall wasp that induces stem galls on Southern live oak (Quercus virginiana) and related oak species. The species exhibits the complex life cycle typical of many oak gall wasps, with alternating sexual and asexual generations that produce morphologically distinct galls. The specific epithet 'quercusbatatoides' references the gall's resemblance to a sweet potato (batata). The species is well-documented in the southeastern United States where its host oaks are native.
Callirhytis quercussuttoni
Gouty Stem Gall Wasp
Callirhytis quercussuttoni is a gall wasp in the family Cynipidae that induces galls on stems of oaks in the red oak group (section Lobatae). The species is restricted to the west coast of North America, where it has been documented on coast live oak (Quercus agrifolia) and interior live oak (Q. wislizeni). Its common name refers to the swollen, irregular galls it produces on host stems.
Caloptilia murtfeldtella
Caloptilia murtfeldtella is a small gracillariid moth known for its distinctive larval biology. The species creates stem galls on Penstemon plants, with larvae developing inside individual galls before emerging through a specially prepared epidermal window. Adults overwinter and have been recorded across multiple U.S. states and Canadian provinces. The species was named in honor of naturalist Mary Murtfeldt, who collected the type specimens.
Celticecis oviformis
Hackberry Spherical Stem Gall Midge
Celticecis oviformis is a gall midge in the family Cecidomyiidae that induces distinctive spherical stem galls on hackberry trees (Celtis species). The species is native to North America and has been documented through gall formation rather than direct observation of the adult midge. The galls are among the most conspicuous and structurally complex of hackberry galls, often persisting on branches for multiple years. The midge completes its life cycle within these galls, with larvae developing inside the protective plant tissue.
Clinodiplosis
Clinodiplosis is a genus of gall midges (Cecidomyiidae, Diptera) established by Kieffer in 1894. Species in this genus are gall inducers that form stem galls on host plants across multiple families including Asteraceae, Myrtaceae, and Urticaceae. The genus has been documented in Brazil and has distribution records in Denmark, Norway, Sweden, and the United States (Vermont).
Diastrophus kincaidii
thimbleberry gallmaker wasp, thimbleberry gall wasp
Diastrophus kincaidii is a cynipid wasp that induces integral stem galls on thimbleberry plants (Rubus parviflorus). The galls form the basis of a complex derivative ecosystem, supporting a weevil and at least nine species of parasitic wasps. Females are flightless and exhibit communal oviposition behavior, with multiple females often ovipositing at the same site. Gall shape and size influence parasitism rates, with large, round, multilocular galls showing lower parasite frequency than small or narrow galls.
Epiblema strenuana
ragweed borer, stem-galling moth
Epiblema strenuana is a tortricid moth native to North America that has been widely introduced as a biological control agent against invasive Asteraceae weeds. Its larvae form stem galls on host plants, functioning as nutrient sinks that place the plant under metabolic stress. The species has established populations in Australia and China, but was rejected for release in India and South Africa due to non-target risks to the oil-seed crop Guizotia abyssinica. Taxonomic confusion with the closely related E. minutana has complicated host range assessments.
Gnorimoschema baccharisella
Coyote Brush Stem Gall Moth
Gnorimoschema baccharisella is a small moth in the family Gelechiidae, first described by August Busck in 1903. It is found in California, where its larvae induce hard stem galls on Baccharis pilularis (coyote brush). The species exhibits sexual dimorphism in forewing size, with females being slightly larger than males.
Lasioptera ephedrae
Mormon Tea Stem Gall Midge
Lasioptera ephedrae is a species of gall midge in the family Cecidomyiidae. It is known for inducing stem galls on Ephedra trifurca, a desert shrub commonly called Mormon tea. The species was described by Cockerell in 1898 and is found in arid regions of the southwestern United States and adjacent Mexico. Like other gall midges, it has a complex life cycle involving intimate association with its host plant.
Neolasioptera boehmeriae
Boehmeria stem gall midge
Neolasioptera boehmeriae is a gall midge in the family Cecidomyiidae, commonly known as the Boehmeria stem gall midge. The species induces galls on false nettles (Boehmeria spp.), with which it has a specialized host relationship. It occurs in the northeastern United States and southern Canada. The species was first described by Beutenmüller in 1908.
Neolasioptera lathami
Neolasioptera lathami is a gall midge species in the family Cecidomyiidae, described by Gagné in 1971. The species is associated with goldenrod (Solidago) host plants, where it induces stem galls. It has been documented in 745 iNaturalist observations, indicating moderate public awareness and detectability. As a member of Neolasioptera, it belongs to a genus of gall midges specialized on asteraceous plants.
Neolasioptera nodulosa
nodular stem gall midge
Neolasioptera nodulosa is a gall midge in the family Cecidomyiidae, commonly known as the nodular stem gall midge. The species induces characteristic nodular galls on host plant stems. It was first described by Beutenmüller in 1907. As a member of the gall midge family, it is part of a diverse group of flies whose larvae develop within plant tissue, causing distinctive growth deformities.
Rabdophaga salicisbatatus
Potato Gall Midge, Tuber-gall Midge
Rabdophaga salicisbatatus is a gall midge in the family Cecidomyiidae that induces distinctive stem galls on willows (Salicaceae). The species is commonly known as the potato gall midge or tuber-gall midge, referencing the swollen, tuber-like galls it produces. It has been documented across much of North America with over 1,100 iNaturalist observations. The adult midge is small and inconspicuous, with the galls being the most visible sign of its presence.
Rhopalomyia baccharis
coyote brush twisted stem gall midge, Baccharis Stem Gall Midge
Rhopalomyia baccharis is a gall midge in the family Cecidomyiidae that induces twisted stem galls on Baccharis species, particularly coyote brush (Baccharis pilularis). The species was described by Felt in 1908 and is associated with host plants in the Asteraceae family. Like other Cecidomyiidae, it has a complete metamorphosis life cycle with distinct larval, pupal, and adult stages.
Rhopalomyia hirtipes
Rhopalomyia hirtipes is a gall midge species in the family Cecidomyiidae that induces distinctive galls on Solidago juncea (early goldenrod) in eastern North America. The species forms large, ovoid, multi-chambered stem galls at the base of host plant stems, surrounded by a rosette of long leaves. Adults emerge in early to late September following larval development and pupation within the gall structure.
Tetramesa
Tetramesa is a genus of minute phytophagous wasps in the family Eurytomidae comprising over 200 described species. Members are exclusively associated with grasses (Poaceae), where they typically induce stem or inflorescence galls. The genus exhibits pronounced host specificity, with most species restricted to a single grass species or closely related congeners. Several species have been deployed as biological control agents against invasive grasses, including T. romana for giant reed (Arundo donax) and candidate agents for medusahead (Taeniatherum caput-medusae) and African lovegrass (Eragrostis curvula). Adults feed on nectar. Recent phylogenomic studies have synonymized the genera Aiolomorphus and Cathilaria within Tetramesa.
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californica
Elliptical Stem Gall Fly
Valentibulla californica is a species of fruit fly in the family Tephritidae, commonly known as the Elliptical Stem Gall Fly. The species was described by Coquillett in 1894. Like other members of the genus Valentibulla, it is associated with gall formation on plant stems. The species is found in the United States, particularly in California as suggested by its specific epithet.