Abstract
This chapter provides information on the main components of the transmission process of Liberibacter asiaticus and other Huanglongbing (HLB)-associated bacteria, i.e. acquisition from infected plants, translocation from the gut into other organs and tissues of the vector, evidence for multiplication in the vector and retention in the vector and inoculation of the pathogen into another host plant. The current knowledge of the HLB-associated bacterial pathosystem are also compared to that associated with L. solanacearum and its psyllid vectors affecting potatoes, tomatoes and other host plants in Solanaceae and Apiaceae, since the modes of transmission seem to be largely similar in both of these pathosystems.