Plant Virus
Viruses are very small (submicroscopic) infectious particles (virions) composed of a protein coat and a macromolecule core. They carry genetic
information encoded in their macromolecule, which usually specifies two or more proteins. Translation of the
genome (to produce proteins) or transcription and
replication (to produce more nucleic acid) takes place within the host cell and uses variety of the host's biochemical "machinery".
Viruses don't capture or store free energy and are not functionally active outside their host. They therefore parasites (and usually pathogens) but aren't usually considered genuine microorganisms. Most
viruses are restricted to a selected kind of host. This is typically concerned with those
viruses that infect plants but we also provide some taxonomic and
genome information about
viruses of fungi, protozoa, vertebrates and invertebrates where these are related to
plant viruses. Chemical or biological control of the
vector (the organism transmitting the disease, often an insect): this may be very effective where the vectors need to feed for a couple of time on a crop before the virus is transmitted but are of much less value where transmission occurs very rapidly and will have already got taken place before the
vector succumbs to the pesticide.
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