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Upon phytopathogen attack or vector herbivory, plants initiate defensive responses. These defenses are mostly regulated by phytohormones. In citrus, Huanglongbing (HLB) is the most harmful disease. HLB is caused by Candidatus Liberibacter asiaticus (CLas) and transmitted by Diaphorina citri. The role of phytohormones in mediating the effect of the CLas-infection and/or D. citri-infestation on Citrus sinensis was investigated using GC-MS-SIM, followed by gene expression analysis. Overall, we quantified eight phytohormones belonging to four different groups (auxins, salicylates, jasmonates, and abscisic acid (ABA)). CLas-infection and D. citri-infestation alter the auxins, salicylates, jasmonates, and ABA profiles in citrus leaves. Additionally, while SA and ABA were associated with defense response against CLas, tJA was involved in response to D. citri-infestation. Gene expression data supported these findings …