THE HLB Epidemic in California

HLB+ Trees

2,458

Total as of Sep 3, 2021.

Updated monthly.

CLas+ ACP 

353

Total as of Sep 1, 2021.

Updated monthly.

Tree samples tested

431,284

Total as of Mar, 2021.

Updated quarterly.

ACP samples tested

427,943

Total as of Mar, 2021.

Updated quarterly.

Data collection and analysis supported by:

Geographic Distribution

Where is the disease being found?

HLB+ trees by city barchart
HLB+ trees by city barchart

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HLB+ tree distribution
HLB+ tree distribution

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CLas+ ACP by city barchart
CLas+ ACP by city barchart

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HLB+ trees by city barchart
HLB+ trees by city barchart

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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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CLas+ ACP by city map
CLas+ ACP by city map

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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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CLas+ ACP proportion positive
CLas+ ACP proportion positive

The proportion of all ACP samples that tested positive for CLas each year.

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CLas+ ACP weekly
CLas+ ACP 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

Bacterial titer of CLas+ ACP samples

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HLB violin plot
HLB violin plot

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Analytical Updates Blog

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

Regulatory Program

Sample numbers plant SoCal
Sample numbers plant SoCal

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Sample numbers plant statewide
Sample numbers plant statewide

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Sample numbers plant SoCal
Sample numbers plant 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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Average flush

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.