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THE HLB Epidemic in California

HLB+ Trees


Total as of March 2023.

CLas+ ACP 


Total as of March 2023.

Tree samples tested


Total as of March 2023.

Updated quarterly.

ACP samples tested


Total as of March 2023.

Updated quarterly.

Data collection and analysis supported by:


Click the images below to view larger, or hover and use the right and left arrows to view more.

Geographic Distribution

Where is the disease being found?

All HLB+ trees have been found in residential areas. No diseased trees have been detected with PCR in a commercial grove.


What patterns are emerging over time?

Bacterial Titer

Is the concentration of bacteria in infected samples changing?

Analytical Updates Blog

Regulatory Program

biological control Program

Data courtesy Dr. David Morgan, USDA.


Numbers at a glance

Lab capacity.jpg
HLB+ trees by variety.jpg
Regional ACP Quarantine zones for the shipment of bulk citrus.
Yellow sticky traps with ACP detected on grove traps within 5 miles of a major transportation route before and after trucks of fruit were requried to be tarped during transit.
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