Abstract
Huanglongbing (HLB or greening) is considered one of the most important citrus diseases in the world. The causative agent of HLB is the Gram-negative bacterium named Candidatus Liberibacter spp. of restricted occurrence to the sieve vessels of the host plant phloem and to the vector insect, Diaphorina citri. Although there are no reports in the literature of the existence of completely re…