Abstract
Huanglongbing (HLB) is the most destructive disease of citrus. In Brazil it is associated bacteria Candidatus Liberibacter asiaticus and Ca. L. americanus, which colonize the phloem causing gradual falling leaves and fruits and decline of the plant. The first one is the most aggressive and most widespread in citrus regions. Symptoms of yellow spots on the leaf begin in one branche and slo…