“ Candidatus Liberibacter solanacearum” (Lso) (=“ Candidatus Liberibacter psyllarous”) is an uncultured, phloem-limited bacterium that is associated with zebra chip disease (ZC) in potato ( Solanum tuberosum L.) and transmitted by the potato psyllid ( Bactericera cockerelli (Šulc)). Vector density and timing of infection have been shown to affect ZC prevalence at harvest; however, little work has been done on disease developme...