What’s that on my tree?
The poplar petiole gall aphid, Pemphigus populitransversus, is unlike many of the aphid species of Idaho, in that it creates galls on the petiole portion of the leaf of poplar trees.
As with most aphids their life cycle is quite complex and involves two host plants – poplar trees as their main host and cruciferous (cabbage, broccoli, mustard, canola etc.) as their summer host.
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