Poplar petiole gall aphid? - Pemphigus populitransversus
Nogales, Santa Cruz County, Arizona, USA August 1, 2022 Size: 17 mm
Galls measured an average of 17 mm long
Found on two Cottonwood trees (Populus deltoides)
Coordinates: 31.360410, -110.936396
Elevation: 3,855 ft
Greater resolution image here