General Mechanisms of Virus Transmission by Arthropods and Nematodes

In the early years viruses were said to be either mechanically transmitted or biologically transmitted by their vectors. Biological transmission was the specific association of a virus with a particular arthropod species or genus and the virus replicated in the vector. Mechanical transmission referred to the nonspecific transmission of viruses, usually by multiple vector species. The viruses did not replicate in the vector and transmission was thought to occur by the simple contamination of vector mouthparts. Most plant viruses do not replicate in their vectors, but it

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