Citrus Quarantine Program (CQP)

Asian Citrus Psyllid
Citrus Outreach Flyer

NEW! The San Diego County Agricultural Commissioner's Office and the Citrus Pest and Disease Prevention Program are hosting a  Citrus Nursery Stock & Huanglongbing workshop on Wednesday, November 20th. Please join us for this free informational event.  See flyer for more information.

    The Asian Citrus Psyllid (ACP) is a pest that acts as a carrier or vector spreading Huanglongbing (HLB), a devastating disease of citrus trees. This bacterial disease is transmitted to healthy trees by the psyllid after it feeds on infected plant tissue. Whether involved in the commercial citrus industry in San Diego County or simply have citrus trees on your property, stay up-to-date on the threat to San Diego County citrus via the links below.

********** Updates (As of 11/13/2019) Posted Below **********


NEW HLB Find in Tijuana, Mexico

    An ACP (Asian Citrus Psyllid) on the outskirts of Tijuana tested positive for Clas, the bacteria that leads to Citrus Greening (a.k.a. HLB). The infected psyllid was found seven miles south of the US-Mexico border. This is the first time an HLB positive psyllid has been found in the area since the United States Department of Agriculture (USDA) began its cooperative program with Mexico. The USDA works cooperatively with Mexico to conduct area wide treatments, biocontrol and surveys in the border region to help prevent the spread of HLB. The find site is currently being treated and surrounding trees and ACP are being tested for HLB. Updates to follow as more info becomes available. 

    As of November 13, 2019, a total of 1,655 trees and 264 ACP samples have tested positive for the HLB bacterium on a total of 1,197 sites. The sites are located in the following counties: Los Angeles, Orange, and Riverside.



New! 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


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,

Jason Schwartze at or by calling (760) 828-5322 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.


Plant Pathology 

Email (Please put “Plant Pathology” in the subject line to ensure timely routing) or call (858) 614-7734 for more information.