Psyllids, also called plant lice, are hemipteran insects that feed on phloem sap. In addition to the direct damage they cause to plants, they are vectors of many phloem-restricted bacterial pathogens belonging to the ' Liberibacter' spp. and ' Phytoplasma' spp. from the apple proliferation group (16SrX). Although ' Liberibacter' spp. cells possess cell walls unlike the phytoplasmas, they both share a reduced genome and unavailability in culture. In addition, psyllids transmit both species of bacteria in a persistent, circulative, and propagative manner. Because of the similarity of these pathosystems, electrical penetration graph (EPG) was employed to study the probing behavior of psyllids. Such studies may assist in understanding the specific interactions between the fastidious bacteria, plant hosts, and insect vectors and lead to innovative control strategies. Herein, we discuss the potential of EPG to study and understand the tritrophic interactions that secure a successful transmission from plant to plant. In addition, the use of EPG in evaluating psyllid control strategies including pesticides and tolerant varieties is reviewed.
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