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Production of citrus, the main fruit tree crop worldwide, is severely threatened by Huanglongbing (HLB), for which as yet a cure is not available. Spread of this bacterial disease in America and Asia is intimately connected with dispersal and feeding of the insect vector  Diaphorina citri , oligophagous on rutaceous host plants. Effective control of this psyllid is an important component in successful HLB management programs. Volatiles released from the non-host guava have been shown to be repellent to the psyllid and to inhibit its response to citrus odour. By analysing VOC emission from guava we identified one volatile compound, ( E )-β-caryophyllene, which at certain doses exerts a repellent effect on  D .  citri . Non-host plant rejection mediated by ( E )-β-caryophyllene is demonstrated here by using  Arabidopsis  over-expression and knock-out lines. For the first time, results indicate that genetically engineered  Arabidopsis  plants with modified emission of VOCs can alter the behaviour of  D .  citri . This study shows that transgenic plants with an inherent ability to release ( E )-β-caryophyllene can potentially be used in new protection strategies of citrus trees against HLB.

β-caryophyllene emitted from a transgenic Arabidopsis or chemical dispenser repels Diaphorina citri, vector of Candidatus Liberibacters