摘要: Publisher Summary This chapter discusses observations on the possible origin and state of occurrence plant viruses in environmental waters evidence for epidemiological importance spread viruses, especially those which lack aerial vectors but are often highly infectious very stable. It also describes methods recovering from water samples. The majority that have so far been identified belong to groups share a number properties: they an vector would ensure their over long distances, reproduced infected plants high concentrations released abundantly roots, stable, can infect via roots without aid vector, wide host range, once established readily neighboring by mechanical contact or again soil transmission. Another means long-distance these under natural conditions may be ingestion moving animals men.