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{{Main|Plant pathology}}
[[File:Pepper mild mottle virus.png|thumb|125px|[[Capsicum|Peppers]] infected by [[
There are many types of [[plant virus]], but often they only cause a decrease in [[crop yield|yield]], and it is not economically viable to try to control them. Plant viruses are frequently spread from plant to plant by organisms called "[[Vector (epidemiology)|vectors]]". These are normally insects, but some [[fungi]], [[nematode]] worms and [[protozoa|single-celled organisms]] have also been shown to be vectors. When control of plant virus infections is considered economical (perennial fruits, for example) efforts are concentrated on killing the vectors and removing alternate hosts such as weeds.<ref>{{harvnb|Shors|2017|p=822}}</ref> Plant viruses are harmless to humans and other animals because they can only reproduce in living plant cells.<ref>{{harvnb|Shors|2017|pp=802–803}}</ref>
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