SUMMARY Plant protection and serological tests showed that the viruses causing the grapevine fanleaf and grapevine yellow mosaic diseases occurring in Portugal, Switzerland and the United States are closely related strains. These strains and arabis mosaic virus cause similar symptoms in many herbaceous species, but arabis mosaic virus is more virulent and more often becomes systemic. Attempts to transmit arabis mosaic virus to grapevine failed. Arabis mosaic virus shares only few antigenic determinants with the viruses obtained from grapevine, and these viruses do not protect plants against it. In a virus classification, the grapevine virus isolates and arabis mosaic virus can be considered two distinct serotypes of one virus. The nematode Xiphinema diversicaudatrim acquired arabis mosaic virus and transmitted it to herbaceous plants but did not transmit the grapevine viruses. As X. index is known to transmit grapevine fanleaf virus and probably transmits grapevine yellow mosaic virus, this suggests specific transmission of virus serotypes by different species of nematodes.
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Dias et al. (1963) studied this question.
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