Detection of Huanglongbing Triggers New Quarantine Area in San Diego County

Statewide

A newly established quarantine area has been declared following the detection of the deadly citrus plant disease Huanglongbing (HLB) in a residential citrus tree located in the Rancho Bernardo area of the city of San Diego. This is the first time the disease has been confirmed in the city of San Diego, marking the second city in San Diego County to have had a positive detection of HLB. The California Department of Food and Agriculture (CDFA) is working with the United States Department of Agriculture (USDA) and San Diego County to treat and remove the HLB-infected tree and prevent the spread of HLB into neighboring areas.

This detection results in the establishment of an HLB quarantine area with a five-mile radius around the find site. The quarantine prohibits residents and commercial operations from moving any host plants within the area, and fruit grown in the area must undergo additional mitigation steps before it can be transported within or from this area. The quarantine zone will not intersect with the existing quarantine boundaries in the Oceanside area of San Diego County.

The updated HLB quarantine maps for San Diego County are now available online. Please check this link for future quarantine expansions, should they occur.

CDFA staff have scheduled the removal of the infected tree and are in the midst of a treatment program for citrus trees within 250-meters of the find site. By taking this action, a critical reservoir of the disease and its vectors will be removed, which is essential to protect other citrus trees on the property, neighboring citrus trees and the community’s citrus from this deadly disease. CDFA, in partnership with USDA, local County Agricultural Commissioners and the citrus industry, continue to pursue a strategy of controlling the spread of the Asian citrus psyllid while researchers work to find a cure for HLB.

Questions? If you are a citrus grower in San Diego County and have questions about this detection, please contact your Grower Liaison Sandra Zwaal at szwaal2@gmail.com.


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