In case of the potato haulm extracts the detection levels were very similar to the ones presented above: 103 cfu mL–1 for Pw, 102 cfu mL–1 for Pba and 102 cfu mL–1 for Dsol. When potato extracts were spiked with more than one bacterial pathogen (combinations of Pwa+Pba, Pwa+ Dsol, Pba+ Dsol and Pwa+Pba+ Dsol), the sensitivity decreased 10–100 times on average, but in case of Dsol the sensitivity did not decrease at all or decreased just tenfold (Table S1).