Blue-oak
Guides
Andricus pedicellatus
hair stalk gall wasp
Andricus pedicellatus, commonly known as the hair stalk gall wasp, is a cynipid wasp that induces distinctive long, spindly leaf galls on blue oaks (Quercus douglasii). The species is fairly common along the Pacific coast of North America. Like other members of the genus Andricus, it exhibits high host specificity, attacking only one or a few closely related oak species.
Cynips multipunctata
Gray Midrib Gall Wasp
Cynips multipunctata is a cynipid gall wasp that induces galls on oak trees, primarily blue oak (Quercus douglasii), in western North America. The species was formerly classified under the genus Besbicus. It is most commonly encountered in California, where it produces distinctive detachable galls on leaf midribs. The galls are solid except for a central larval chamber.
Feron atrimentum
Striped Volcano Gall Wasp
Feron atrimentum is a cynipid gall wasp that induces distinctive galls on blue oak (Quercus douglasii) leaves. The species exhibits cyclical parthenogenesis with alternating sexual and parthenogenic generations, each producing morphologically distinct gall types. The common name refers to the volcano-shaped galls with red stripes produced by the parthenogenic generation.
Feron pattersonae
Plate Gall Wasp
Feron pattersonae, the plate gall wasp, is a cynipid wasp that induces distinct galls on white oaks, particularly blue oak (Quercus douglasii). The species exhibits cyclical parthenogenesis with two alternating generations per year: an all-female parthenogenetic generation and a bisexual generation. Each generation produces morphologically different galls—flat, circular, plate-like galls in summer, and pointed capsule galls on hair-like stems later in the year. The bisexual generation's galls were originally described as a separate species, Andricus pedicellatus, by Alfred Kinsey in 1922.