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Bois noir, a disease of the grapevine yellows complex, is associated with ‘ Candidatus  Phytoplasma solani’ and transmitted to grapevines in open fields by the cixiids  Hyalesthes obsoletus  and  Reptalus panzeri . In vine-growing areas where the population density of these vectors is low within the vineyard, the occurrence of bois noir implies the existence of alternative vectors. The aim of this study was to identify alternative vectors through screening of the Auchenorrhyncha community, phytoplasma typing by  stamp  gene sequence analyses, and transmission trials. During field activities, conducted in Northern Italy in a vineyard where the bois noir incidence was extremely high, nine potential alternative insect vectors were identified according to high abundance in the vineyard agro-ecosystem, high infection rate, and harbouring phytoplasma strains characterized by  stamp  gene sequence variants found also in symptomatic grapevines. Transmission trials coupled with molecular analyses showed that at least eight species ( Aphrodes makarovi ,  Dicranotropis hamata ,  Dictyophara europaea ,  Euscelis incisus ,  Euscelidius variegatus ,  Laodelphax striatella ,  Philaenus spumarius , and  Psammotettix alienus/confinis ) are alternative vectors of ‘ Candidatus  Phytoplasma solani’ to grapevines. These novel findings highlight that bois noir epidemiology in vineyard agro-ecosystems is more complex than previously known, opening up new perspectives in the disease management.

Identification and ecology of alternative insect vectors of ‘Candidatus Phytoplasma solani’ to grapevine