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California Non-Oak Galls
Acacia greggii (catclaw) Alnus sp. (alder) Arctostaphylos sp. (manzanita) Artemisia tridentata (sagebrush)
Contarinia sp.
Catclaw Leaflet Gall Midge
Phytoptus laevis
Alder Bead Gall Mite
Tamalia coweni
Manzanita Leaf Gall Aphid
Rhopalomyia pomum
Sponge Gall Midge
Atriplex sp. (saltbush)
Asphondylia floccosa
Woolly Stem Gall Midge
Asphondylia sp.
Pom-Pom Bud Gall Midge
Baccharis pilularis (coyote brush)
Gnorimoschema baccharisella
Baccharis Stem Gall Moth
Puccinia evadens
Baccharis Rust Gall Fungus
Rhopalomyia baccharis
Coyote Brush Stem Gall Midge
Rhopalomyia californica
Coyote Brush Bud Gall Midge
Ceanothus sp. (ceanothus)
Asphondylia ceanothi
Ceanothus Bud Gall Midge
Asphondylia sp.
Vein Gall Midge
Chrysolepis chrysophylla (giant chinquapin) and Chrysolepis sempervirens (bush chinquapin)
Dryocosmus castanopsidis
Chinquapin Flower Gall Wasp
Dryocosmus sp.
Ericameria sp. (rabbitbrush) Garrya sp. (silk tassel)
Rhopalomyia utahensis
Cotton Gall Midge
Rhopalomyia sp.
Spiny Cone Gall Midge
Asphondylia garryae
Silk Tassel Gall Midge
Juniperus californica (California juniper)
Walshomyia juniperina
Juniper Urn Gall Midge
Walshomyia sp.
Juniper Gall Midge
Larrea tridentata (creosote bush)
Asphondylia apicata
Creosote Bush Gall Midge
Asphondylia auripila
Creosote Stem Gall Midge
Asphondylia digitata
Creosote Antler Gall Midge
Asphondylia discalis
Creosote Bush Paddle Gall Midge
Asphondylia fabalis
Creosote Bush Gall Midge
Asphondylia florea
Creosote Bush Flower Gall Midge
Asphondylia foliosa
Leafy Bud Gall Midge
Asphondylia pilosa
Leaf Club Gall Midge
Asphondylia resinosa
Creosote Resin Gall Midge
Asphondylia rosetta
Creosote Cone Gall Midge
Contarinia sp.
Clasping Leaf Gall Midge
Populus sp. (poplars; cottonwoods)
Pemphigus populivenae
Cottonwood Leaf Gall Aphid
Pemphigus sp.
Rosa sp. (roses)
Diplolepis californica
Leafy Bract Gall Wasp
Diplolepis nebulosa
Diplolepis polita
Spiny Leaf Gall Wasp
Diplolepis rosae
Pincushion Gall Wasp
Diplolepis rosaefolii
Rose Blister Gall Wasp
Salix sp. (willows)
Iteomyia sp.
Willow Tooth Gall Midge
Iteomyia sp.
Willow Tube Gall Midge
Pontania sp.
Willow Gall Sawfly
Rabdophaga rigidae
Willow Beaked-gall Midge
Rabdophaga salicisbrassicoides
Willow Rosette Gall Midge
Salvia mellifera (sage)
Rhopalomyia audibertiae
Sage Leaf Gall Midge

For more information about California galls, see the Field Guide to Plant Galls of California and Other Western States by Ronald Russo.