"Wirusy roślinne." . . . . . . . . . "The plant viruses polyhedral virions with tripartite genomes" . . . "The viruses and their taxonomy. Members of the tricornaviridae. Taxonomic considerations.Coclusions. Virus particle stability structure. Atomic resolution structures of spherical viruses. Virus descriptions and structures. Viral genome structure. General struture of tripartite genomes. RNA sequence and gene content. Sequence and structure of viral RNAs. Satellite RNAs of the cucumoviruses. Virus multiplication. Experimental systems. Virus entry and uncoating. Virus replication. Assembly in relations to virus replications. Cellular location of RNA replication. Cell-to-Cell spread. Conclusions. Virus genetics. Analysis of pseudorecombinants constructed from. Analysis of incomplete infections. Analysis of mutants. Summary and prospects. Glossary of mutants cited in this chapter. Virus-Host relationships: symptomalogical and ultrastructural aspects. Effects of virus infection on host morphology and cell. Symptomalogy. Cytopathogy. Concluding remarks. Serology and immunochemistry. Immunological techniques. Serological relationships. Immunochemical studies. Taxonomic implications. Concluding remarks. Virus transmission. Modes of transmission. Concluding remarks. Virus Epidemiology and control. Pollen-borne virus es. Aphid-borne viruses. Epidemiology of bromoviruses. Control. Discussion." . . . . . . . . "Polyhedral virions with tripartite genomes" . . . . "Virus phytopathogènes." . . "Virus à ARN." . . . . "RNA wirusy." . .