Association of "Candidatus liberibacter solanacearum" with Zebra chip disease of potato established by graft and psyllid transmission, electron microscopy, and PCR - Secor, G. A.; Abad, J. A.; Claver, G. R. C.; Li, X.; Rivera, V. V.; Lee, I-M; Liefting, L. W.; De Boer, S. H.