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Galls of the beadlike cottonwoodgall aphid, Thecabius (=Pemphigus) populimonilis, (left) and poplar stemgall aphid, Pemphigus populicaulis.

Cottonwoodgall aphid on leaves, UCD Arboretum Credit: Jack Kelly Clark
Galls of the beadlike cottonwoodgall aphid, Thecabius (=Pemphigus) populimonilis, (left) and poplar stemgall aphid, Pemphigus populicaulis. Credit: Jack Kelly Clark
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