HLB Laboratory: Procedure for Sampling and Shipping Plant Material
Please follow the instructions below to submit citrus samples to be screened for
the presence of Candidatus Liberobacter asiaticus, the causal agent of HLB.
- Collect leaves with stems intact from live branches with fully expanded
leaves. Samples should be collected from symptomatic branches if present.
- Submit a minimum of 10 leaves. Please do not submit fruit samples.
- Place the sample into a re-sealable plastic bag (e.g., Zip-lock), squeeze the air
from the bag and seal it.
- Assign and record on the bag a unique sample identification number (Grower’s
- Complete a corresponding HLB Sample
Submission Form. Forms are available here. Please make sure the Sample
Submission Form is complete, providing the exact sample location. We will not process
samples lacking sample location and/or client information.
- Place the form and the bagged sample into a second resealable bag. Keep samples
cool (on ice) until shipment. Do not freeze the samples.
- Samples should be submitted in person or shipped overnight either
on the day collected or before noon the following day (samples will deteriorate
if delayed in transit).
Please submit samples Monday through Thursday only to:
2685 SR 29 N
Immokalee, Fl 34142
Additional, detailed information about sampling procedures can be
Results will be submitted to the client in a timely manner. Results will be reported
as positive, negative or inconclusive:
- A positive result indicates the presence of Candidatus Liberobacter asiaticus in
the sample under our testing conditions.
- A negative result indicates that Candidatus Liberobacter asiaticus was NOT DETECTED
in the sample under our testing conditions, but does not unequivocally indicate
that the sample is free of Candidatus Liberobacter asiaticus. If an HLB sample result
is negative, resubmission at a later time should be considered.
- An inconclusive result indicates that another sample should be resubmitted and retested.