Further Host Range and Transmission Studies With a Virus Disease of Carrot Endemic in Australia

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Abstract
Further host range studies with the carrot virus are described. The aphid Cavariella aegopodii transmitted the virus to several non-umbelliferous spp., but failed to recover the virus from these spp. It was observed, however, that they were extremely unpalatable and possibly toxic to the vector. Heteroplastic grafts between infected petunia and healthy carrot resulted in 2 infections in the latter sp., although graft unions were not recorded. The virus was transmitted to tobacco, but not to carrot, by sap inoculation from infected petunia. Symptoms on all hosts except Datura stramonium were masked by rising temps. and intensified by low temp. conditions. Petunia, tobacco, and D. stramonium are regarded as good differential hosts. From these studies it is concluded that the carrot virus is distinct from any previously described. The common name carrot motley dwarf is, therefore, proposed for the virus and the disease.

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