Entomologia Generalis (2022) 42, 185-215

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Jürgen Gross, Jannicke Gallinger and Louisa M. Görg (2022)
Interactions between phloem-restricted bacterial plant pathogens, their vector insects, host plants, and natural enemies, mediated by primary and secondary plant metabolites
Entomologia Generalis 42 (2), 185-215
Abstract: Phytopathogens are responsible for devastating plant diseases threatening agriculture and food security worldwide. Phloem-restricted bacterial plant pathogens belonging to the classes mollicutes (' Candidatus Phytoplasma', Spiroplasma), α-proteobacteria, and γ-proteobacteria have a significant impact on several high-value crops. These bacteria are obligate parasites, depending on their plant and insect hosts. Inside the plants, they are restricted to the phloem, which is a source of primary and secondary plant metabolites representing a suitable niche for them. Additionally, phloem sap is utilized for nutrition by multiple Hemipterans and several species within the leafhopper, planthopper, and psyllid taxa, which can acquire and transmit the phloem-dwelling bacteria during feeding. The present review aims at providing an overview of interactions between phloem-restricted bacterial plant pathogens and their vector insects, which are mediated by primary and secondary plant metabolites. The overview is organized in two sections describing the current knowledge of phloem and volatile metabolite mediated interactions between pathogens, their host plants, their vector insects, and where information is available, the antagonists of vectors. This bibliographic oriented part is followed by a comprehensive synthesis of the reviewed literature and important research gaps were identified. The evolution of plant - pathogen - vector systems and novel trends on pest management strategies of phloem-restricted bacteria, in which semiochemicals are applied, are discussed. Finally, an outlook on future prospects is given.
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Database assignments for author(s): Jürgen Gross

Research topic(s) for pests/diseases/weeds:
transmission/dispersal of plant diseases

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Diaphorina citri
	Bactericera cockerelli