Technical Abstract: The successful transmission of plant pathogens reliant on insect vectors is dependent on the vector inoculation efficiency and how rapidly the insect can effectively transmit the disease pathogen to the host. The potato psyllid, Bactericera cockerelli (Šulc), has recently been found to transmit “Candidatus Liberibacter solanacearum”, a bacterium associated with zebra chip (ZC), an emerging and economically important disease of potato in some parts of the world. Currently, little is known about the epidemiology of ZC and its vector’s inoculation capabilities. Studies were conducted in the field and laboratory to 1) assess the transmission potential of potato psyllid nymphs and adults, 2) determine if psyllid inoculation access period affected ZC incidence, severity and potato yield, and 3) determine how fast the psyllid can transmit liberibacter to potato and cause development of ZC. Results showed that adult potato psyllids were highly efficient vectors of liberibacter that causes ZC and that nymphs were less efficient than adults at transmitting this bacterium. It was also determined that inoculation access period had little influence on overall ZC disease incidence, severity, and resulting yield loss. Moreover, results showed that exposure of a plant to 20 adult potato psyllids for a period as short as one hour resulted in ZC symptom development. Furthermore, it was shown that a single adult potato psyllid was capable of inoculating liberibacter to potato within a period as short as six hours, thereby inducing development of ZC. This information will help in developing effective management strategies for this serious potato disease.