Citrus greening disease (Chinese: 黃龍病; pinyin: huánglóngbìng abbr. HLB) is a disease of citrus caused by a vector-transmitted pathogen. The causative agents are motile bacteria, Liberibacter spp. The disease is transmitted by the Asian citrus psyllid, Diaphorina citri, and the African citrus psyllid, Trioza erytreae. It has no known cure. It is ...