Subtropical Fruit Crops Research & Education
University of California
Subtropical Fruit Crops Research & Education

Asian Citrus Psyllid

ACP Information

Asian Citrus Psyllid Picture
Asian citrus psyllid (Diaphorina citri Kuwayama) The Asian citrus psyllid, Diaphorina citri, is a tiny, mottled brown insect about the size of an aphid. This insect poses a serious threat to California's citrus trees because it vectors the pathogen that causes huanglongbing disease (HLB). This disease is the most serious threat to citrus trees worldwide—including those grown in home gardens and on farms. The psyllid feeds on all varieties of citrus (e.g., oranges, grapefruit, lemons, and mandarins) and several closely related ornamental plants in the family Rutaceae (e.g., calamondin, box orange, Indian curry leaf, and orange jessamine/orange jasmine). Click here to learn more about this psyllid and disease control from Citrus Insider.

Link To Resources

Learn more about HLB and how to protect your crops from it by following these links.

News Stories: 

Distribution & Management: 

IPM Blog: 

IPM Pest Notes 

California Citrus Pest & Disease Prevention Committee: 

USDA Asian Citrus Psyllid Information

Ventura County Farm Bureau Information

ACP Information At Citrus Insider

Visit The Citrus Insider Website

CDFA ACP Plant Information


Pests In The Urban Landscape Blog

Other News On ACP

Master Gardeners Website

Visit The Website Here

Topics In Subtropics



Distribution of ACP, HLB and parasites in California

Here you'll find a zoomable map to see how many trap cards have had Asian Citrus Psyllids (ACP) since 2008 at the section level (one mile square area).

The Asian Citrus Psyllid and Citrus Disease Huanglongbing

Report A Psyllid

If you think you've spotted Asian Citrus Psyllids on your tree or your tree is infected with Huanglongbing act fast. Call the free statewide pest hotline at 800-491-1899 to speak to an expert. For other inquiries, complete the form below. 


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