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Plant Pest Diagnostic Clinic

                     We have moved!

We are now located in 228 Clark Hall.



The Washington State University Plant Pest Diagnostic Clinic is dedicated to serving the state of Washington and its citizens by providing the highest quality service by providing plant disease and disorder diagnosis, pest identification, and management strategies. The Plant Pest Diagnostic Clinic provides plant health problem diagnosis to homeowners; greenhouse and nursery operations; public and private landowners; and commercial growers including those involved with agriculture, horticulture, and floriculture

To submit a sample for DIAGNOSIS, please fill out a submission form and follow the sample guidelines.

 Please Note: Hemp samples MUST be accompanied by a Washington State Hemp Producer’s License

To submit a sample for VIRUS testing, please fill out a Virus Test Submission Form

To submit samples for LITTLE CHERRY VIRUS and WESTERN X, please fill out a Little Cherry Disease Response Diagnostic Request form  

Please Note: We are currently accepting samples for Little Cherry and Western X testing. Cost for testing is $50/test/sample.  

Washington State University operates two Plant Pest Diagnostic Clinics, in Puyallup and in Pullman. Services of either clinic are available to clients statewide; samples from eastern Washington are usually submitted to Pullman.

To send a sample from a state other than Washington, please contact the clinic prior to submission. Out of state samples will be charge double the service fee.

Please Note: We cannot accept cannabis samples due to WSU compliance with Federal policy.

Contact Us:


Clinic Phone Number: 509-335-3292


Shipping Information:

Clinic USPS mailing address:
Plant Pest Diagnostic Clinic
Department of Plant Pathology
P.O. Box 646430
Pullman, WA  99164-6430
Clinic UPS and FedEx address:
Plant Pest Diagnostic Clinic
Department of Plant Pathology
410 Dairy Road
Pullman, WA  99164
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