San Joaquin Wildlife Sanctuary, Orange County, CA. 7/19/09. © 2009 Elliotte Rusty Harold

Poplar Petiole Gall Aphid

Pemphigus populicaulis


San Joaquin Wildlife Sanctuary, Orange County, CA. 7/19/09. © 2009 Elliotte Rusty Harold

San Joaquin Wildlife Sanctuary, Orange County, CA. 7/19/09. © 2009 Elliotte Rusty Harold

San Joaquin Wildlife Sanctuary, Orange County, CA. 7/19/09. © 2009 Elliotte Rusty Harold
 

Petiole gall on Fremont Cottonwood, Populus fremontii. San Joaquin Wildlife Sanctuary, Orange County, CA. 8/2/12. © Peter J. Bryant

In petiole gall on Fremont Cottonwood, Populus fremontii. San Joaquin Wildlife Sanctuary, Orange County, CA. 8/2/12. © Peter J. Bryant

Fundatrix? In petiole gall on Fremont Cottonwood, Populus fremontii. San Joaquin Wildlife Sanctuary, Orange County, CA. 8/2/12. © Peter J. Bryant

Winged adult. In petiole gall on Fremont Cottonwood, Populus fremontii. San Joaquin Wildlife Sanctuary, Orange County, CA. 8/2/12. © Peter J. Bryant