willow apple gall sawfly

Euura californica

Member of willow gall sawflies (genus Euura)
gall sawflies
common sawflies (family Tenthredinidae)
typical sawflies (superfamily Tenthredinoidea)
insects (class Insecta)
hexapods (subphylum Hexapoda)
willow galls
arthropods (phylum Arthropoda)
animals (kingdom Animalia)
galls

forms on leaf surfaces of willows (genus Salix)

smooth red blister

Chris’s observations: 14 (none are research grade)

Locations:

Coal Creek OSP: 3
Coyote Hills RP: 2
Murray Ranch SP: 2
Sweeney Ridge National Recreation Area: 2
Bear Creek Redwoods OSP
Lake Chabot RP
San Bruno Mountain State & County Park
Sibley Volcanic RP
Waterdog Lake & Open Space

Months:

Mar.: 1
Apr.: 0
May: 0
Jun.: 1
Jul.: 2
Aug.: 4
Sep.: 4
Oct.: 1
Nov.: 1

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Taxon info: iNaturalist – Gallformers

Bay Area species: iNaturalist