Advances in Understanding Phytoplasma Interactions with Plants and Insects

Phytoplasmas are obligate intracellular plant pathogens causing devastating plant diseases worldwide. This review summarizes recent advances uncovering the molecular mechanisms by which phytoplasmas reprogram plant development, alter immunity, and modulate insect vector behavior. We present insights into phytoplasma effector protein diversity and their molecular targets, particularly transcription factors and proteasome components. We then discuss multipartite interactions among phytoplasmas, plants, and insects and consider disease development in the context of environmental change. Additionally, we explore the role of insect vector microbiomes and emerging biocontrol strategies. Future research priorities include integrated systems biology to develop sustainable, targeted interventions that mitigate phytoplasma-associated crop losses amid global change pressures. Overall, this review bridges knowledge from molecular biology to applied plant pathology to support innovative phytoplasma control strategies.