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The Asian citrus psyllid, first detected in Arizona in 2009, is a sap-sucking insect of the family Psyllidae, responsible for spreading greening disease among citrus trees. It’s just one of the plant pests and pathogens from which the Arizona Plant Diagno (Photo: David Hall/Agricultural Research Service – USDA) The Asian citrus psyllid, first detected in Arizona in 2009, is a sap-sucking insect of the family Psyllidae, responsible for spreading greening disease among citrus trees. It’s just one of the plant pests and pathogens from which the Arizona Plant Diagnostic Network works to protect Arizona’s plants.