KAC Citrus Entomology
University of California
KAC Citrus Entomology

Asian Citrus Psyllid

Asian citrus psyllid adult
Asian citrus psyllid adult
psyillid lifecycle

Basic Information

Life Cycle: Asian citrus psyllid (ACP), Diaphorina citri,  mates and deposits eggs, that then hatch and pass through 5 nymphal instars.  For more information on the biology, see ANR Publication 8205 Asian Citrus Psyllid or the homeowner pest note ANR Publication 74155 Asian citrus psyllid.

Host List: Asian citrus psyllid attacks citrus and closely related plants in the Rutaceae.  See the California State Quarantine for the known hosts of ACP.

Damage: The psyllid attacks leaves and stems of citrus.  When it feeds, it injects a toxin that causes twisting and death of the leaves.  More importantly, it is an efficient vector of the bacterium Candidatus liberibacter asiaticus that causes Huanglongbing disease (HLB).  This disease is one of the most devastating diseases of citrus; causing leaves to yellow, fruit to become bitter and eventually death of the tree. For more information on the disease, see ANR Publication 8218 Citrus Bacterial Canker Disease and Huanglongbing (Citrus Greening).

Distribution: The map shows the North American distribution of the psyllid (orange areas) and areas where both the psyllid + HLB disease  are found (green areas).  HLB is found in parts of Florida, Georgia, S. Carolina, Louisiana, Cuba, Belize, Nicaragua, Honduras and Mexico. In California, ACP was first found in 2008 in Imperial and San Diego counties and has since spread to Orange, Los Angeles, Ventura, San Bernadino and Riverside counties.  It has been found primarily in yards, not commercial citrus.  HLB was found in March 2012 in a tree in Los Angeles California in an urban situation.   


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