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Pemphigus populivenae
2222_2234 Photo added 2011-03-20

Pemphigus populivenae (Hymenoptera: Aphididae)
Cottonwood Leaf Gall Aphid
Everson, Whatcom County, Washington
June 7, 2010

Leaf gall on Populus balsamifera ssp. trichocarpa (black cottonwood). This is the dorsal view.

all photos and text © Joyce Gross