Host range and properties of Grapevine fanleaf and Grapevine yellow mosaic viruses.
At Rothamsted when sap-transmissible viruses [cf. 41, 695] were isolated from vines with fanleaf, yellow mosaic, distorting mosaic, witches' broom, or fasciation diseases, the isolates from American, Australian, French, and Portuguese vines were similar but varied in virulence. Fanleaf and yellow mosaic viruses were able to infect 32 herbaceous spp., yellow mosaic usually causing distinctive symptoms in systemically infected Chenopodium amaranticolor, although symptoms of both viruses in some hosts were indistinguishable. Both were reproduced by transmission back to grapevine from C. amaranticolor, were transmitted through seed of this host, and were precipitated without inactivation by ethanol, acetone, ammonium sulfate, and at pH 5. Partially purified preparations from systemically infected Nicotiana clevelandii contained polyhedral particles 30 mµ diam. Most of the European vine virus diseases appear to be due to strs. of 1 virus. Attempts to transmit a str. of Portuguese urticado virus by Myzus persicae failed, a result differing from that reported by other workers [40, 452] who claimed to have obtained a virus from vines which was transmissible between herbaceous plants by M. persicae.