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Pemphigus spyrothecae
2222_2009 Photo added 2010-01-10

Pemphigus spyrothecae (Hemiptera: Aphididae)
Everson, Whatcom County, Washington
July 16, 2009

Aphid gall (cut open) on petiole of Populus nigra var. italica (Lombardy poplar).

all photos and text © Joyce Gross