Editing Plant virus (section)

=== By plasmodiophorids ===

A number of virus genera are transmitted, both persistently and non-persistently, by soil borne [[zoospore|zoosporic]] [[protozoa]]. These protozoa are not phytopathogenic themselves, but [[parasitic]]. Transmission of the virus takes place when they become associated with the plant roots. Examples include ''[[Polymyxa graminis]]'', which has been shown to transmit plant viral diseases in cereal crops<ref>{{cite journal |last1=Kanyuka |first1=Konstantin |last2=Ward |first2=Elaine |last3=Adams |first3=Michael J. |year=2003|title=Polymyxa graminis and the cereal viruses it transmits: a research challenge |journal=Molecular Plant Pathology |volume=4 |issue=5|pages=393–406 |doi=10.1046/j.1364-3703.2003.00177.x |pmid=20569399 |doi-access=free}}</ref> and ''[[Polymyxa betae]]'' which transmits [[Beet necrotic yellow vein virus]]. Plasmodiophorids also create wounds in the plant's root through which other viruses can enter.