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“From the time citrus was first recognized as an edible fruit with positive nutritional qualities, it has moved with man, and so too have its pests and diseases,” wrote Tim R. Gottwald of the USDA in a 2010 review article. That is the story of huanglongbing, also known as citrus greening, which was first recorded in India in the 1700s and now threatens every citrus-producing region of the world.

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SOURCES: “CITRUS FRUIT: FRESH AND PROCESSED: ANNUAL STATISTICS 2012,” BY U.N. FOOD AND AGRICULTURE ORGANIZATION (citrus production); “CITRUS HUANGLONGBING (GREENING) DISEASE,” IN INVASIVE SPECIES COMPENDIUM, BY CENTER FOR AGRICULTURAL BIOSCIENCE INTERNATIONAL, 2013 www.cabi.org/isc (HLB disease)

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