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The recent emergence of several plant diseases caused by psyllid-boe bacterial pathogens worldwide (Candidatus Liberibacter spp.) has created renewed interest on the interaction between psyllids and bacteria.In spite of these efforts to understand psyllid association with bacteria,many aspects of their interactions remain poorly understood.As more organisms are studied,subtleties on the molecular interactions as well as on the effects of the bacteria on the psyllid host are being uncovered.Additionally,psyllid-boe bacterial phytopathogens can also affect the host plant,which in tu can impact psyllid physiology and behavior.Here,we review the current literature on different aspects of the influence of bacteria on multitrophic interactions among plants,psyllids,and pathogens.We then highlight gaps that need to be addressed to advance this field,which can have significant implications for controlling these newly emergent and other plant diseases.