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A threat to our citrus

A deadly plant disease called Huanglongbing (HLB) that kills citrus trees has been found in California. The disease is spread by a pest called the Asian citrus psyllid (ACP) as it feeds on citrus tree leaves. Until researchers find a solution, California homeowners who enjoy growing fresh citrus fruit in their yards must take action to protect their trees.

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How to protect your citrus »

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Where is HLB and the ACP?

ACP Detections Sporadic

In this county, the ACP has been found sporadically, but not yet considered generally infested. There are no confirmed detections of HLB.

ACP Generally Infested

The county is considered generally infested with the ACP. There are no confirmed detections of HLB.

ACP Generally Infested and HLB Detected

The county is considered generally infested with the ACP. HLB has been detected in the county. An HLB quarantine zone has been established encompassing parts of the county to prevent further spread of the pest and disease. Find out if you are located within a quarantine zone.

Frequently Asked Questions

If you suspect your tree has symptoms of HLB or the ACP, contact the California Department of Food and Agriculture (CDFA) free pest hotline at 800-491-1899 to report what you are seeing, and an expert will be in touch about next steps.

HLB can infect all citrus varieties, as well as closely related plants in the citrus family such as orange jasmine and curry leaf plants.

The ACP and HLB are not harmful to humans or animals, but HLB is fatal for citrus trees.

There is no cure for HLB. Once a tree is infected it will die. It is important for HLB-infected trees to be removed so the ACP pest does not feed on the tree and further spread the disease. CDFA performs tree removal free of charge.

CDFA has trained surveyors who inspect residential citrus trees. As crews inspect residential citrus trees to look for the ACP or HLB symptoms, they may collect samples to take back to the lab for further testing.

Residents can request that CDFA or their local county agricultural commissioner collect ACP and plant samples from their trees to have the samples tested for bacteria that causes HLB. CDFA will only remove trees that are confirmed positive for HLB or trees with an ACP nymph that tests positive for the bacteria that causes HLB. If a sample of an adult ACP collected from the tree tests positive, the tree will be resampled, but not removed.