Uroleucon (Lambersius) escalantii (Knowlton) (syn. nov.) is declared a junior synonym of Uroleucon (Lambersius) erigeronense (Thomas) based on examination of slide mounted material from many hosts and localities, using data from host plant transfers, and DNA sequences. A diagnosis and new information on the host plant biology of the species are also provided.
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aphids
Canadian horseweed
Chrysothamnus
Conyza
Ericameria
gray horsebrush
hoary aster