Abstract
Huanglongbing (HLB) is one of the major diseases of citrus, which is caused by the Gram-negative bacteria of the genus Candidatus Liberibacter The main symptoms of HLB in plants are the yellowing of the branches, chlorosis of the leaves and damages to the fruits, which become asymmetric, small, with aborted seeds and bitter taste. In Asia and the Americas, the spread of the disease occur…