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We open Volume 7 with a series of four chapters on plant virus
transmission by insects. In Chapter 1, Karen Gibb and John Randles
present preliminary information about an association between the
plant bug Cyrtopeitis nicotianae (Heteroptera: Miridae) and velvet
tobacco mottle virus (VTMo V): the only reported instance of mirid
transmission of a known virus. Mirids could be considered as likely
vectors of plant viruses because they are phytophagous, possess a
piercing-sucking-feeding apparatus, have winged adults, and are
cosmopolitan pests of a wide range of crops. Surprisingly, however,
there are only three plant viruses purportedly transmitted by
heteropterous vectors, compared with the nearly 250 by homopterous
ones. To what extent these figures reflect actual differences in
the abilities of members of the two suborders to transmit plant
pathogens remains to be determined. Compared with the Homop tera,
the Heteroptera have been ignored by researchers as potential
vectors of plant viruses. The authors are quick to point out that
additional studies are needed before generalizations can be made
about virus-mirid-plant interactions and that virus transmission by
mirids is not easily characterized using the conventional
transmission criteria and terminology established for such
homopterous vectors as aphids and leafhoppers. Transmission of
VTMoV by C. nicotianae appears to have characteristics in common
with both nonpersistent noncirculative and circulative (persistent)
transmission."
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