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Virus classification
Group: Group IV ((+)ssRNA)
Order: Tymovirales
Family: Betaflexiviridae
Genus: Trichovirus
Type species

Trichovirus is a genus of viruses in the order Tymovirales, in the family Betaflexiviridae. Plants, specifically angiosperms such as pome fruits, citrus, and pear, serve as natural hosts for this plant pathogen. There are currently seven species in this genus including the type species Apple chlorotic leaf spot virus.[1][2]


Group: ssRNA(+)



Viruses in Trichovirus are non-enveloped, with flexuous and filamentous geometries. The diameter is around 10-12 nm, with a length of 640-760 nm. Genomes are linear, around 7.5-8.0kb in length. The genome codes for 3 proteins.[1]

Genus Structure Symmetry Capsid Genomic arrangement Genomic segmentation
Trichovirus Filamentous Non-enveloped Linear Monopartite

Life cycle[edit]

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 is the method of transcription. The virus exits the host cell by tubule-guided viral movement. Plants, pome fruits, citrus, and pear serve as the natural host. Transmission routes are grafting.[1] It is transmitted by mites of the family Eriophyidae, requiring a helper virus for transmission.

Genus Host details Tissue tropism Entry details Release details Replication site Assembly site Transmission
Trichovirus Pome fruits; citrus; pear None Viral movement; mechanical inoculation Viral movement Cytoplasm Cytoplasm Grafting; propagating material


  1. ^ a b c "Viral Zone". ExPASy. Retrieved 15 June 2015. 
  2. ^ a b ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015. 

External links[edit]