''Barley mild mosaic bymovirus'' is a
plant virus
Plant viruses are viruses that affect plants. Like all other viruses, plant viruses are obligate intracellular parasites that do not have the molecular machinery to replicate without a host. Plant viruses can be pathogenic to higher plants.
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See also
See the article in French, "Jaunisse nanisante de l'orge":
https://fr.wikipedia.org/wiki/Jaunisse_nanisante_de_l%27orge
References
Brunt, A.A., Crabtree, K., Dallwitz, M.J., Gibbs, A.J., Watson, L. and Zurcher, E.J. (eds.) (1996 onwards).
Bymoviruses
Viral plant pathogens and diseases
{{Virus-stub