Citrus Quarantine Program (CQP)

Citrus grove and trees with Asian Citrus Psyllid

What is the Citrus Quarantine Program?

AWM’s Citrus Quarantine Program (CQP) helps protect California citrus by working with growers, gardeners, and the public to prevent the spread of citrus pests and diseases. 

One such disease is Huanglongbing (HLB), a citrus-greening disease that is deadly to citrus trees and a threat to our local citrus industry. HLB is spread by the Asian citrus psyllid (ACP), a tiny insect that may transmit the bacteria between trees as it feeds on new growth. While HLB is deadly to citrus, it does not harm people, animals, or other plants. 

HLB has no cure. But by working together, we can save our citrus from this deadly disease: work with agricultural officials to inspect your trees for signs of HLB and ACP. Help protect local citrus by learning the signs of HLB, and for suspicious symptoms, call the CDFA hotline (1-800-491-1899).

Active HLB Quarantines

Updated September 2025

San Diego Citrus Quarantine Map as of September 2025
San Diego HLB Quarantines (per CDFA's Map)


San Diego County has ongoing HLB quarantines in: Fallbrook, Oceanside, Rancho Bernardo, Valley Center, and, most recently, Northwestern Camp Pendleton. Statewide, there are HLB quarantines in Los Angeles, Orange, Riverside, San Bernardino, and Ventura counties. Across the state, more than 10,000 trees have tested positive for the disease and been removed since 2012.

The most recent quarantine began after CDFA detected HLB on a residential citrus tree in San Clemente on August 27, 2025. The new quarantine area spans from southern Orange County to northern San Diego County. The quarantine is in the San Onofre and Agra areas and includes the northwestern part of Camp Pendleton. The infected tree is removed, and officials are surveying and treating a 250-meter area.

All citrus growers, packers, transporters, and fruit sellers in the county must have an ACP Compliance Agreement from AWM to move any citrus fruit (contact CQP.AWM@sdcounty.ca.gov for more information). Residents and commercial operations in a five-mile radius of any HLB quarantine area are prohibited from moving citrus and HLB host plants or plant materials. Additionally, fruit grown must undergo mitigation steps before transport.

To learn more and see if you’re in a quarantine area, visit the Citrus Pest & Disease Prevention Program.

Identifying HLB

HLB Symptoms

Symptoms

  • Blotchy, asymmetrical yellowing of leaves 
  • Yellowing shoots 
  • Lopsided, small, and rancid-tasting fruit 
  • Premature and excessive fruit drop 

More Information

HLB Resources for Growers

When a tree tests positive for HLB, CDFA removes the tree and surveys the surrounding 250-meter area to reduce the chance of spread. A mandatory five-mile HLB quarantine radius is then established from the find site. It’s prohibited to move host nursery stock, host plants, or plant parts out of a quarantine area. 

HLB Resources for Residents

Homeowners can protect their backyard citrus trees by supporting the work of agricultural officials. To help prevent the spread of HLB, residents should:   

  • Not move citrus into or out of their area.  
  • Remove all leaves and stems, and thoroughly wash backyard citrus before moving from the property where it was grown.  
  • Allow agricultural employees to access your property to survey citrus trees and take samples to look for the disease.  
  • When grafting, use only registered budwood with source documentation.   
  • Dry or double-bag plant clippings prior to disposal.  
  • Talk to your local home and garden center about products that can protect citrus trees against ACP.   
  • Buy trees from reputable, licensed California nurseries.  
  • Visit CaliforniaCitrusThreat.org to learn more about ACP and HLB and to see pictures of symptoms and signs of the pest and disease.   

HLB-infected trees must be removed to protect neighboring trees, the community’s citrus, and the state’s vibrant citrus industry. HLB is not harmful to humans or animals, but it is fatal for citrus trees. There is no cure for HLB, and infected trees will die. For suspicious symptoms, call the CDFA hotline (1-800-491-1899). 

Additional Resources

HLB in San Diego

Helpful Websites

Notices of Treatment

  • CDFA treats for Asian Citrus Psyllid (ACP) in San Diego County when no other mitigation methods are available. CDFA posts Notices of Treatment (NOTs) at least 48 hours in advance.  

Videos

Dangers of Moving Citrus in California

Contact Information

  • Residents can contact the San Diego County Department of Agriculture, Weights & Measures’ Citrus Quarantine Program. 
  • Commercial Growers can also contact the CDFA Citrus Pest and Disease Prevention Division.