Scaphoideus titanus, also known as the American grapevine leafhopper, is the primary vector for flavescence dorée phytoplasma (FDp). Originating in North America, this leafhopper was first observed in Europe in 1958, where it came into contact with the phytoplasma. Grapevine flavescence dorée, the disease caused by this phytoplasma, can cause significant damage to vineyards, and from its spread by S. titanus, it is now found in many wine-growing regions of Europe. Due to the large impacts reported from Europe and the concern for the growing viticulture industry in the UK, S. titanus was made a provisional quarantine pest. This PRA has been undertaken to further investigate the likelihood of introduction of S. titanus and to assess the possible impacts where S. titanus acts as a vector for ‘Candidatus Phytoplasma vitis’ (Ca. P. vitis) causing flavescence dorée (FD) disease in grapevine