Feron izabellae

Distinguished from other oak gall wasps by the unique bow-tie shape of mature galls, with folded edges toward the center. The pink coloration and small size (up to 5mm) of galls, combined with occurrence on specific white oak hosts in California and Oregon, aid identification. Adults are identified by nearly uniform light brown to yellowish coloration with slightly darker head.

Adults are almost uniformly light brown to yellowish in color with a slightly darker head. The induced galls are small, up to 5mm in diameter, pink in color, and spangle-shaped with edges that fold toward the center at maturity, creating a bow-tie appearance.

Associated with white oak woodlands and scrublands. Galls develop on the abaxial (lower) leaf surface of host oaks.

Known from Northern California and Oregon. Documented on four white oak species: California scrub oak (Quercus berberidifolia), Oregon oak (Quercus garryana), blue oak (Quercus douglasii), and leather oak (Quercus durata).

Galls mature in September or October. Adult emergence occurs after gall maturation in autumn.

• California scrub oak - gall inductionQuercus berberidifolia
• Oregon oak - gall inductionQuercus garryana
• blue oak - gall inductionQuercus douglasii
• leather oak - gall inductionQuercus durata

Only the asexual generation is known. The life cycle involves gall induction on oak leaves, gall maturation through summer, and adult emergence in autumn. The sexual generation, if it exists, remains undescribed.

Gall inducer on white oaks. Creates distinctive leaf galls that may affect host plant physiology and provide microhabitats for other organisms.

Of interest to entomologists and naturalists studying gall wasp diversity. The distinctive gall morphology makes it readily identifiable in the field.

• Other Feron speciesInduce spangle galls on oaks, but F. izabellae is distinguished by the unique bow-tie fold of mature galls and pink coloration
• Other Cynipidae on California oaksMany induce galls on similar hosts, but the specific gall morphology and host combination are diagnostic

• gall wasp
• oak gall
• Cynipidae
• California endemic
• asexual generation
• leaf gall
• spangle gall
• white oak associate
• recently described species

• BugGuide
• Wikipedia
• iNaturalist taxon
• NCBI Taxonomy