coyote brush bud gall midge

Rhopalomyia californica

Member of gall midges (subfamily Cecidomyiinae)
nematoceran flies (suborder Nematocera)
flies (order Diptera)
baccharis galls
insects (class Insecta)
hexapods (subphylum Hexapoda)
arthropods (phylum Arthropoda)
animals (kingdom Animalia)
galls

Caution: There may be other wild species of this genus not yet included in this guide.

forms in place of buds on coyote brush (Baccharis pilularis)
a lumpy gall up to 20 mm wide at the tip of a branch
often has leaves growing through the gall

Chris’s observations: 45 (38 are research grade)

Locations:

Edgewood County Park & Natural Preserve: 6
Bear Creek Redwoods OSP: 3
San Bruno Mountain State & County Park: 3
Waterdog Lake & Open Space: 3
Fremont Older OSP: 2
Russian Ridge OSP: 2
San Pedro Valley CP: 2
Windy Hill OSP: 2
Calero CP
Coyote Valley OSP
Dr. Aurelia Reinhardt Redwood RP
El Corte de Madera OSP
Henry Cowell Redwoods SP
Huckleberry Botanic RP
Jacks Peak CP
Lake Chabot RP
Monte Bello OSP
Mt. Madonna SP
Murray Ranch SP
Nisene Marks SP
Pescadero Creek CP
Picchetti Ranch OSP
Sanborn CP
Santa Teresa CP
Sibley Volcanic RP
Sierra Azul; OSP
Sweeney Ridge National Recreation Area
Thornewood OSP
Wilder Ranch SP
Wunderlich CP

Months:

May: 6
Jun.: 4
Jul.: 4
Aug.: 4
Sep.: 4
Oct.: 3
Nov.: 8
Dec.: 4
Jan.: 2
Feb.: 5
Mar.: 1

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Taxon info: iNaturalist – BugGuide – Gallformers

Bay Area species: iNaturalist