THE HLB Epidemic in California

HLB+ Trees

3,785

Total as of Sep 2022.

CLas+ ACP 

472

Total as of Sep 2022.

Tree samples tested

568,838

Total as of Sep 2022.

Updated quarterly.

ACP samples tested

531,073

Total as of Sep 2022.

Updated quarterly.

Data collection and analysis supported by:

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

Figures show latest available data, through March 2022.

Geographic Distribution

Where is the disease being found?

HLB+ trees by city
HLB+ trees by city

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CLas+ ACP by city
CLas+ ACP by city

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HLB+ trees by city
HLB+ trees by city

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

CA HLB detections by grid
CA HLB detections by grid

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CA CLas+ ACP detections by grid
CA CLas+ ACP detections by grid

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CA HLB detections by grid
CA HLB detections by grid

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TEMPORAL dISTRIBUTION

What patterns are emerging over time?

HLB proportion positive
HLB proportion positive

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ACP CLas+ proportion positive
ACP CLas+ proportion positive

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CLas+ ACP samples detected weekly
CLas+ ACP samples detected weekly

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HLB proportion positive
HLB proportion positive

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Bacterial Titer

Is the concentration of bacteria in infected samples changing?

HLB+ violin plot
HLB+ violin plot

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CLas+ ACP violin plot
CLas+ ACP violin plot

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HLB+ violin plot
HLB+ violin plot

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Analytical Updates Blog

Regulatory Program

Plant sample numbers SoCal
Plant sample numbers SoCal

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Plant sample numbers statewide
Plant sample numbers statewide

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Plant sample numbers SoCal
Plant sample numbers SoCal

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ACP sample numbers SoCal
ACP sample numbers SoCal

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ACP sample numbers statewide
ACP sample numbers statewide

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ACP sample numbers SoCal
ACP sample numbers SoCal

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biological control Program

Data courtesy Dr. David Morgan, USDA.

Biocontrol releases- South
Biocontrol releases- South

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Biocontrol releases- North
Biocontrol releases- North

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T. radiata nymph finds
T. radiata nymph finds

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Biocontrol releases- South
Biocontrol releases- South

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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.