PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY
Asian citrus psyllids (Diaphorina citri) feeding on a citrus stem. These insects transmit the bacteria that causes citrus greening disease. Also known as huanglongbing (HLB), this disease causes mottled leaves and small, bitter fruits that remain partly green even when ripe. There is no cure. An adult psyllid that is not infected with HLB must feed on an infected tree for many days before it becomes infected with the bacterium. In contrast, psyllid nymphs developing on HLB-infected trees can acquire the disease just before reaching the adult stage, and can immediately transmit the disease to uninfected trees.
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