Plant Pest Diagnostic Clinic
The WSU Pullman Plant Diagnostic Clinic is closed as of December 1, 2025. For alternative diagnostic support, please contact your local WSU Extension specialist, Master Gardener Coordinator, or other diagnostic resources, such as:
- WSU Puyallup Plant & Insect Diagnostic Lab – Jenny Glass (jennyglass@wsu.edu,253-445-4582)
- Oregon State University Hermiston Plant Disease Clinic – Dr. Ken Frost or Cassandra Funke (cassandra.funke@oregonstate.edu, 541-567-8321 ext. 120 or (Kenneth.Frost@oregonstate.edu)
- University of Idaho Parma REC Diagnostic Lab – Dr. James Woodhall (jwoodhall@uidaho.edu)
- Richard Old, Weed Identification (rold@pullman.com)
If you need further assistance, please contact Melissa Bills, Administrative Manager for the WSU Department of Plant Pathology (melissa.bills@wsu.edu, 509-335-4852) or Dr. Lindsey du Toit, Chair of the Department of Plant Pathology (dutoit@wsu.edu, 360-848-6140).
The Washington State University Plant Pest Diagnostic Clinic is dedicated to serving the state of Washington and its citizens through high 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.
Diagnosis
To submit a sample for Diagnosis, please fill out a submission form (pdf) and follow the sample guidelines.
Please Note: Hemp samples MUST be accompanied by a Washington State Hemp Producer’s License
Virus
To submit a sample for virus testing, please fill out a Virus Test Submission Form (pdf).
Clinic Locations
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
Shipping Information
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
