Diversity and distribution of gall-forming aphids of the genus Pemphigus (Sternorrhyncha: Aphididae, Pemphigini) in Eastern Siberia

We reviewed the diversity and distribution of the gall-forming aphids of the genus Pemphigus developing on poplars in Eastern Siberia. As a result, the checklist of this group was compiled comprising 13 species distributed in this macroregion that accounts about 29% of the world's known poplar-feeding Pemphigus species. Biogeographical and host plant data are provided for all listed species. Pemphigus birimatus Ivanovskaja, Pem. laurifoliae Dolgova, and Pem. matsumurai Monzen were documented for the first time in the Republic of Tuva. In addition, the latter two species were also discovered in the Republic of Buryatia and Zabaikalskii Krai, respectively. Two poplars Populus × sibirica and Pop. laurifolia were recorded as novel hosts for 3 Pemphigus species. The origin of Pem. passeki Börner, Pem. spyrothecae Passerini, and Pem. microsetosus Aoki in Eastern Siberia remains unclear. Four species Pem. populi Courchet, Pem. bursarius (Linnaeus), Pem. matsumurai, and Pem. spyrothecae Lichtenstein cause noticeable damage to poplars in man-made plantations.