curtovirus curtovirus curtovirus is a genus of ssdna viruses, in the family geminiviridae. dicotyledonous plants serve as natural hosts. curtoviruses are transmitted by leafhoppers. there are three species in this genus. diseases associated with this genus include: curly top disease. curtovirus virus classification (unranked): virus realm: monodnaviria kingdom: shotokuvirae phylum: cressdnaviricota class: repensiviricetes order: geplafuvirales family: geminiviridae genus: curtovirus species beet curly top virus horseradish curly top virus spinach severe curly top virus structure viruses in curtovirus are non-enveloped, with icosahedral geometries, and t=1 symmetry. the diameter is around 22 nm, with a length of 38 nm. genomes are circular and non-segmented, around 3.0kb in length. genusstructuresymmetrycapsidgenomic arrangementgenomic segmentation curtovirustwinned icosahedralincomplete t=1non-envelopedcircularmonopartite 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. dicotyledonous plants serve as the natural host. the virus is transmitted via a vector (beet leafhopper). transmission routes are vector. genushost detailstissue tropismentry detailsrelease detailsreplication siteassembly sitetransmission curtovirusdicotyledonous plantsphloem-limitedviral movement; mechanical inoculationbuddingnucleusnucleusbeet leefhopper