Aphid Galls Rising on Elms: True Identity Update
I identified the culprit behind the elm sack galls pictured in the BYGL Alert posted yesterday as the aphid, Tetraneura ulmi. However, thanks to input from Dan Potter (University of Kentucky, Entomology), I learned that the true identity is actually another closely related elm gall-making aphid, T. nigriabdominalis.
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