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).
Visit the Clinic
The Plant Pest Diagnostic Clinic is located in 228 Clark Hall on the WSU campus in Pullman. Clark Hall is the building between Hulbert Hall and Food Science and Human Nutrition.
Parking
Permits are required for parking in visitor spaces and may be purchased for $5-6 at the Visitor Center. Visitor and metered parking spaces are available on the streets north and south of Clark Hall. An hourly parking garage is located near the Compton Union Building (CUB).
Ship Samples To
Clinic USPS mailing address:
Plant Pest Diagnostic Clinic
Department of Plant Pathology
P.O. Box 646430
Pullman, WA 99164-6430
UPS and FedEx address:
Plant Pest Diagnostic Clinic
Department of Plant Pathology
410 Dairy Road
Pullman, WA 99164
Please do not mail on a Friday or before any national holiday as the specimens may deteriorate over the weekend.