Composite Nature of Certain Potato Viruses of the Mosaic Group


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.


  1. 1

    Ann. Appl. Biol., 16, Nos. 1, 3.

  2. 2

    Smith, Ann. Appl. Biol., 18, No. 1; Wingard, Jour. Agric. Res., 37, No. 3.

  3. 3

    Kentucky Agric. Exp. Stat. Bull., 309.

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SMITH, K. Composite Nature of Certain Potato Viruses of the Mosaic Group. Nature 127, 702 (1931).

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