Painted Maple Aphid (Drepanaphis acerifoliae) and Black-Bordered Oak Aphid (Myzocallis walshii) (Hemiptera: Aphididae)—New Alien Invasive Species for the Fauna of Russia

Abstract— Two Nearctic aphid species Drepanaphis acerifoliae (Thomas, 1878) and Myzocallis (Lineomyzocallis) walshii (Monell, 1879) (Hemiptera: Aphididae) were reported for the fauna of Russia from urban plantings of Donetsk, Mariupol, and Berdyansk for the first time. The identified species are monoecious holocyclic and trophically associated with introduced North American tree species. Within their secondary range, D. acerifoliae and M. walshii are monophagous, with D. acerifoliae feeding on the leaves of Acer saccharinum L. and M. walshii feeding on the leaves of Quercus rubra L. Feeding on other introduced and autochthonous species of Quercus L. and Acer L. genera in the collection of the Donetsk Botanical Garden was not noted. Also, on Q. rubra, the feeding of the native European species Tuberculatus (s. str.) querceus (Kaltenbach, 1843) was first recorded, and the feeding of Lachnus roboris (Linnaeus, 1758) was revealed on Q. rubra in Russia for the first time. Colonies of D. acerifoliae and M. walshii were not attended by ants, and no predators or parasitoids were recorded. At this stage of invasion, the identified species do not exhibit significant harmfulness, apart from leaf contamination with sugary secretions. However, the population dynamics require monitoring. Given the widespread use of silver maple and red oak in ornamental landscaping and afforestation, it is likely that D. acerifoliae and M. walshii are more widely distributed throughout the European part of Russia than currently documented.