A gnat-sized insect known as the Asian citrus psyllid has been spreading a deadly plant disease, huanglongbing, through America's citrus groves. Early attempts to contain the disease have failed, and it has become a major threat to the U.S. citrus industry. Huanglongbing is caused by bacteria, Candidatus liberibacter, which the Asian citrus psyllids carry in their salivary glands. The bacteria infiltrate plants' circulatory systems, which then results in blockages that stop the flow of nutrient
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