Population Development of Alien Gall-Forming Aphid Tetraneura nigriabdominalis on Ulmus minor and Ulmus glabra

Tetraneura (Tetraneurella) nigriabdominalis (Sasaki, 1899) is a holocyclic and heteroecious species widely distributed throughout the world. Its primary hosts are various elm species, on which it forms galls. The results of this study complement those previous research development T. hosts. Our was conducted two Ulmus minor glabra, at three locations for successive seasons between 2017 2019. Fundatrices hatched 27 April 12 May. first galls were observed 6–8 days after hatching date fundatrices. On average, there 1–7.5 one leaf. highest abundances found in medial basal parts leaf blades. fundatrices matured within 12–21 produced nymphs 2–3 weeks. fecundity influenced by temperature April, size laminae, females developing U. glabra more fecund (2–58 nymphs), whereas 1–29 nymphs. winged migrants second generation appeared late May June, when cracks also observed. entire aphid generations host temperature-dependent lasted from four to almost six show that suitable nigriabdominalis. aphids proceeded similarly both tree species. Temperature, especially significantly duration individual developmental phases