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subsp.  and  (Smith) Yabuuchi et al. race 3 are the causal agents of ring-rot and brown-rot of potato respectively. These diseases represent a serious threat to potato production in temperate climates. Both bacteria are listed as A2 pests in the EPPO region and as zero-tolerance quarantine organisms in the European Union. All the detection tests developed so far were only focused on the detection of a single pathogen while the absence of both bacteria has to be certified in the seed tubers. We have therefore developed a new multiplex real-time PCR assay to simultaneously detect both bacteria in a single assay. Additionally, the reliability of this molecular diagnostic test has been improved by the simultaneous amplification of an internal control, corresponding to a potato gene co-extracted from the sample. The polyvalence and the specificity of each set of bacterial primers and probes were evaluated on more than 90 bacterial strains. The limit of detection of this triplex real-time protocol was similar to those observed with other molecular protocols previously developed for the individual detection of one of these bacteria. A concordance of 100 % was obtained in a blind test mimicking the routine application of the technology. In conclusion, this new protocol represents a straightforward and convenient method potentially adapted to primary screening of potato tubers.

european journal of plant pathology

Development of the simultaneous detection of Ralstonia solanacearum race 3 and Clavibacter michiganensis subsp. sepedonicus in potato tubers by a multiplex real-time PCR assay