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Plant Pest Diagnostic Clinic

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 (pdf) and follow the sample guidelines.

To submit a sample for VIRUS testing, please fill out a Virus Diagnostic Assay Request (pdf)

To submit samples for LITTLE CHERRY VIRUS and WESTERN X, please fill out a LCD-X-Test-Form

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.

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


Rachel Bomberger, M.S.
Plant Diagnostician

(509) 335-3292

There are no upcoming events at this time.

Shipping Information

Clinic USPS mailing address:
Rachel Bomberger
Plant Pest Diagnostic Clinic
Department of Plant Pathology
P.O. Box 646430
Pullman, WA  99164-6430
Clinic UPS and FedEx address:
Rachel Bomberger
Plant Pest Diagnostic Clinic
345 Johnson Hall
100 Dairy Road
Pullman, WA  99164
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