Babuvirus
Babuvirus is a genus of viruses, in the family "Nanoviridae". "Musa" species serve as natural hosts. There are three species in this genus. Diseases associated with this genus include: stunting, severe necrosis and early plant death. BBTV induces banana bunchy top disease (BBTD). Taxonomy. The following species are included in the genus: Structure and genome. Viruses in the genus "Babuvirus" are non-enveloped, with icosahedral and round geometries, and T=1 symmetry. The diameter is around 18-19 nm. Genomes are multipartite with 6 to 8 circular segments. Genome size is around 81 kb in totsl. Life cycle. Viral replication  is nuclear. Entry into the host cell is achieved by penetration into the host cell. Replication follows the ssDNA rolling circle model. DNA templated transcription is the method of transcription. The virus exits the host cell by nuclear pore export, and tubule-guided viral movement. "Musa" species serve as the natural host. The virus is transmitted via a vector (aphids). Transmission routes are vector.