Bud-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 opertus
Fimbriate Gall Wasp
Andricus opertus is a cynipid gall wasp that induces distinctive galls on California oaks. The species exhibits alternation of generations, with bisexual and unisexual forms producing different gall types. The bisexual generation creates elongate, spiky leaf galls, while the unisexual generation forms aborted bud galls. This species is part of the highly diverse Andricus genus, which contains numerous oak-associated gall wasps.
Callirhytis quercusagrifoliae
bud gall wasp
Callirhytis quercusagrifoliae, commonly known as the bud gall wasp, is a cynipid gall wasp that induces galls specifically on the flower buds of coast live oaks (Quercus agrifolia) and interior live oaks (Quercus wislizeni). The species has been documented in California, North America. Like other cynipids, it manipulates plant tissue development through chemical secretions to create protective structures for its larvae.
Disholcaspis prehensa
clasping twig gall wasp
Disholcaspis prehensa is a gall-inducing cynipid wasp native to California that induces distinctive galls on scrub oak and leather oak. The species exhibits heterogony, alternating between sexual and asexual generations that produce two morphologically different gall types. The asexual generation forms conspicuous mushroom-shaped twig galls with clasping bases, while the sexual generation produces small, hidden bud galls.
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anthracinus
Oyster Gall Wasp
Neuroterus anthracinus is a gall wasp in the family Cynipidae that forms chemically induced leaf galls on oak trees. The species exhibits heterogony, alternating between sexual and agamic (parthenogenetic) generations that produce two distinct gall types: the oyster gall and the April-bud gall. This wasp has been widely distributed across Europe and has been introduced to North America.