First report of a North American aphid Uroleucon luteolum Williams (Hemiptera: Aphididae) in Japan

This is the authors' abstract. We don't add key points for this paper.

This is the first record of the introduction of Uroleucon luteolum Williams (Hemiptera: Aphididae) from North America to Japan. Uroleucon luteolum primarily feeds on Solidago spp. in the native range, and there have been no reports of its dispersion to other continents or islands. We found this species colonizing on Solidago altissima L. (Asteraceae) in Ibaraki Prefecture from 2022 to 2024, suggesting its introduction and establishment in this area had been for at least three years. Specimens were identified using morphological keys and further confirmed by comparing their DNA sequences with those of closely related species. We newly found morphological intraspecific variation in U. luteolum , and revised the identification keys accordingly. Furthermore, rearing experiments revealed that U. luteolum clones in Ibaraki exhibit an anholocyclic life cycle, although they occasionally produced oviparous morphs under high-temperature conditions. We discuss the ecological characteristics of U. luteolum that we found and the expansion possibility of this aphid in Japan.