Abstract
Grapevine virus A and Grapevine virus B are members of the genus Vitivirus, in the family Flexiviridae. They are causative agents responsible for diseases in grapevines and are considered to be of great economic importance for viticulture. Virions are flexuous filaments, contain a single positive stranded RNA, are strictly phloem-limited, and are restricted to a single host, the grapevine…