oat blue dwarf virus oat blue dwarf virus oat blue dwarf virus (obdv) is a plant pathogenic virus of the family tymoviridae. it replicates within leafhopper vectors, and when these vectors feed, the virus is transmitted to the plant. it can infect oats and barley. oat blue dwarf virus virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: kitrinoviricota class: alsuviricetes order: tymovirales family: tymoviridae genus: marafivirus species: oat blue dwarf virus synonyms flax crinkle virus