cucumovirus cucumovirus cucumovirus is a genus of viruses, in the family bromoviridae. plants serve as natural hosts. there are four species in this genus. cucumovirus cucumber mosaic virus symptoms virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: kitrinoviricota class: alsuviricetes order: martellivirales family: bromoviridae genus: cucumovirus species cucumber mosaic virus gayfeather mild mottle virus peanut stunt virus tomato aspermy virus taxonomy the following species are assigned to the genus: cucumber mosaic virus gayfeather mild mottle virus peanut stunt virus tomato aspermy virus structure viruses in the genus cucumovirus are non-enveloped, with icosahedral and spherical geometries, and t=3 symmetry. the diameter is around 29 nm. genomes are linear and segmented, tripartite. genusstructuresymmetrycapsidgenomic arrangementgenomic segmentation cucumovirusicosahedralt=3non-envelopedlinearsegmented life cycle viral replication is cytoplasmic. entry into the host cell is achieved by penetration into the host cell. replication follows the positive stranded rna virus replication model. positive stranded rna virus transcription, using the internal initiation model of subgenomic rna transcription is the method of transcription. the virus exits the host cell by tubule-guided viral movement. plants serve as the natural host. transmission routes are mechanical and contact. genushost detailstissue tropismentry detailsrelease detailsreplication siteassembly sitetransmission cucumovirusplantsnoneviral movement; mechanical inoculationviral movementcytoplasmcytoplasmmechanical inoculation: insects; contact epidemiology it is thought that cucumoviruses are present worldwide, being known to occur in eurasia, australia, canada, france, india, japan, north and south korea, morocco, new zealand, poland, spain, the us, and the former ussr. its natural hosts belong to the domain eukaryota. the virus is transmitted by vector, mechanical inoculation, grafting, or seeds, and it is transmitted in a non-persistent manner. the vectors may be arthropods, specifically insects of the order hemiptera, family aphididae (colloquially one would say cucumovirus is transmitted by aphids).