Citrus Quarantine Program (CQP)

Asian Citrus Psyllid

The department’s Citrus Quarantine Program (CQP) supports and promotes the local citrus industry by enforcing Asian Citrus Psyllid (ACP) and Huanglongbing (HLB) quarantine regulations. Inspections conducted by CQP inspectors ensure compliance in order to suppress the movement of ACP and therefore mitigate the potential spread of HLB into the region. 

********** Updates (As of 07/23/2021) Posted Below **********

First CLas-positive Asian citrus psyllid found in San Diego County – 12/31/2020

An Asian citrus psyllid (ACP) sample – confirmed positive for Candidatus Liberibacter asiaticus (CLas), the bacteria that causes Huanglongbing (HLB) – was collected from a residential property in the Fallbrook area of San Diego County. While the first confirmation of a CLas-positive ACP in San Diego County is concerning, as of today, HLB has not been detected in any San Diego County trees but surveying and sampling of area trees is ongoing. For more information, click here -

New Special Permit Quarantine Commodity 1543 for Bulk Citrus Movement from Adjacent ACP Quarantine Zone into HLB Quarantine Area

Effective July 31, 2020, bulk citrus fruit may be shipped directly to a packinghouse or processor located within a Huanglongbing (HLB) quarantine area without meeting the ACP-free performance standard, provided that the shipment originates from the immediately adjacent, surrounding Asian citrus psyllid (ACP) bulk citrus regional quarantine zone. All shipments of citrus fruit must continue to be fully safeguarded with a tarp or enclosed vehicle while in transit. For more information, click here.


    As of July 23, 2021, a total of 2,417 trees and 344 ACP samples have tested positive for the HLB bacterium on a total of 1,759 sites. The sites are located in the following counties: San Diego, Los Angeles, Orange, Riverside, and San Bernardino. 



NEW! Learn how to support the HLB fight as a citrus hobbyist at FruitMentor’s Youtube page (links below)


Dangers of Moving Citrus Fruit in California (Vietnamese)

English / Español / Tiếng Việt / 한국어 / 普通话 / 粵語


The Citrus Pest & Disease Prevention Program (CPDPP) Released a new 30-second Public Service Announcement (PSA), “What If California Citrus Disappeared?”

What if citrus disappeared?

English Version (YouTube) | Spanish Version (YouTube)

And if you haven't seen the County of San Diego's ACP/HLB PSA, click below!


Don't Spread the Asian Citrus Psyllid (YouTube)


California Citrus Pest and Disease Prevention Committee (CPDPC) endorses “Best Practices for Growers in Response to HLB in California.”

To provide California citrus growers with a strong toolbox of options to protect their orchards from Huanglongbing (HLB), the Citrus Pest & Disease Prevention Committee has endorsed the following “Best Practices for Growers in Response to HLB in California.” The recommendations – which are grouped based on a grower’s proximity to an HLB detection – represent the most effective tools known to the citrus industry at this time and are meant to supplement the California Department of Food and Agriculture’s required regulatory response.

Growers are encouraged to use as many methods as feasible for their operation in order to limit the spread of the Asian citrus psyllid (ACP) and HLB, as the cost to manage the Asian citrus psyllid is far less than any potential costs or loss to the industry should HLB take hold throughout our state.

Please visit for more information.


Huanglongbing (HLB) Sampling for Growers

HLB Sample Collection and Submission Protocol

Citrus Pest Detection Program (CPDP) Services

The following are links that are provided to assist both homeowners and industry members alike.


Citrus Pest & Disease Prevention Program (CPDPP)

Homeowner Oriented:

Industry Oriented:


California Department of Food and Agriculture (CDFA) ACP Information

CDFA Notice of Treatment (NOT) Information

CDFA currently coordinates areawide treatments for ACP present in San Diego county when no other mitigation methods are available. CDFA posts Notices of Treatment (NOTs) at least 48 hours in advance of any treatment. To view NOTs for San Diego county, please click here.


United States Department of Agriculture Animal and Plant Health Inspection Service (APHIS) Citrus Information


Contact Information

Residents can contact the San Diego County Dept. of Agriculture, Weights & Measures’

Citrus Quarantine Program at or by calling (858) 614-7770 for more information.

Commercial Growers can also contact the San Diego County Grower Liaison, Sandra Zwaal, at for more information.


Entomology Lab

Email (Please put “Entomology” in the subject line to ensure timely routing) or call (858) 614-7738 for more information.