Plant Sample Submissions  


Growers should inspect and report symptoms of Huanglongbing (HLB) immediately to the California Department of Food and Agriculture’s hotline: 800-491-1899.

The Citrus Pest Detection Program (CPDP), located in Tulare, is able to provide HLB testing services of plant samples from growers throughout the state except HLB quarantine areas via mail. However, growers located in the San Joaquin Valley can request CPDP representatives take samples from their orchard for testing rather than mailing it. Learn about sampling, testing protocols, grower costs and other questions by calling the CPDP: 559-686-4973.

If you’re interested in submitting plant samples as part of a proactive, routine testing effort, the flier linked below provides guidance on how to collect and submit samples to permitted labs.

How to Submit Plant Samples

About CPDP

The Citrus Pest Detection Program (CPDP) has served the survey and diagnostic needs of the citrus industry since 1963. Due to the threat of the spread of HLB to commercial citrus groves, the CPDP switched its survey emphasis from Citrus tristeza virus (CTV) to HLB.

Experienced CPCP field personnel are trained for visual inspection of HLB symptoms and the Asian citrus psyllid, and plant sample collections. Non-regulatory testing under CDFA permit is performed by skilled technicians in their state-of-the-art Polymerase Chain Reaction (PCR) laboratory.