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A 3-year survey was conducted in Northern Italy to verify the presence and diversity of phytoplasmas in selected vineyards showing symptoms of severe yellows. Symptomatic and asymptomatic grapevines were sampled, and insects were collected using yellow sticky traps. The phytoplasmas detected in grapevine samples were different according to the years: “flavescence dorée” (16SrV-C/D) was detected together with other phytoplasmas such as 16SrXII-A (‘Candidatus Phytoplasma solani’-related, bois noir), 16SrI-B (‘Ca. P. asteris’-related, aster yellows), 16SrX-B (‘Ca. P. prunorum’-related, European stone fruit yellows), and 16SrV-A (‘Ca. P. ulmi’-related, elm yellows). Moreover, phytoplasmas belonging to 16SrVII-A (‘Ca. P. fraxini’-related) and 16SrVI (‘Ca. P. trifolii’-related) subgroups were also identified. Identification of phytoplasmas was also carried out from insects and showed the presence of some of these phytoplasmas in Scaphoideus titanus and Orientus ishidae: 16SrXII-A, 16SrVII, and 16SrVI phytoplasmas were detected in specimens of both species, while 16SrXII-A and 16SrI-B phytoplasma strains were identified in Orientus ishidae and Hyalesthes obsoletus, and 16SrX-B in S. titanus. Direct sequencing of selected amplicons obtained from 16S rRNA, rp, and tuf genes from grapevine and insect samples confirmed the phytoplasma identification. The 16SrVII-A and 16SrVI phytoplasmas were never detected before in grapevine, S. titanus and Orientus ishidae in Europe and their epidemiological importance is being monitored.

Molecular Diversity of Phytoplasmas Associated with Grapevine Yellows Disease in North-Eastern Italy