IN 1928 some experiments on the transmission of a potato mosaic virus to tobacco revealed the curious fact that needle and aphis (Myzus persicæ) inoculation respectively, from the same mosaic-affected potato plant, produced in tobacco symptoms characteristic of the method of infection.1 The disease produced by the needle has since been shown to be a complex, the constituent viruses of which, for the sake of clarity, will be referred to as x and y, where x represents the virus which forms in tobacco double concentric rings with a central spot, hereinafter referred to as ‘ringspot’, and y represents the aphis-borne virus, the symptoms of which take the form of a darkening of the green colour of the tissues along the veins.
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Smith, Ann. Appl. Biol., 18, No. 1; Wingard, Jour. Agric. Res., 37, No. 3.
Kentucky Agric. Exp. Stat. Bull., 309.
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