[Electron microscopical evidence of Spiroplasma citri in nucleus of infected testplants (author's transl)].

This is the first report for the evidence of mycoplasmas in an organelle of a plant cell. Spiroplasma citri was detected by electron microscopy in the nucleus of a phloem parenchyma cell of Chrysanthemum carinatum Schousboe plants, inoculated experimentally by Euscelis plebejus Fall.