Bird Cherry-Oat Aphid
Rhopalosiphum padi
insectView on iNaturalist
Small, dark green to blackish aphid on grasses and birch trees. Plant sap-feeder; significant crop and ornamental pest in Bay Area; prey for beneficial insects.
Plants that support Bird Cherry-Oat Aphid
5 plants
California Brome
Bromus carinatus var. carinatus
grass
early season colonization of emerging grass foliage
Bay Area native
Foxtail Barley
Hordeum jubatum subsp. jubatum
grass
Spring-summer population on emerging shoots; vector for barley yellow dwarf virus
Bay Area native
Pale Galingale
Cyperus eragrostis
grass
Spring colonization of sedges and grasses, vector for plant viruses
Bay Area native
Slender Wheatgrass
Elymus trachycaulus subsp. trachycaulus
grass
sap-feeding on grass leaves; supports insectivorous birds
Bay Area native
Spike Bent
Agrostis exarata
grass
Sap-feeding pest and food source for beneficial insects; present in cool seasons
Bay Area native