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Verify the disease or pest before you act

Posted by | April 29, 2016

alfalfa-plant-bugThe Washington State University Plant Pest Diagnostic Clinic, and the Puyallup Plant and Insect Diagnostic Laboratory, provide plant problem diagnosis for the state of Washington and surrounding areas.

Accurate diagnosis of plant diseases, disorders, and pests is the first step in implementing a successful integrated pest management (IPM) program.

The Plant Pest Diagnostic Clinic accepts samples from commercial growers, homeowners, public and private landowners, nursery and greenhouse operators, foresters, extension specialists, consultants, agriculture and horticulture-based industries, and government programs.


  • Full Service Plant Problem Diagnosis ($40).

This option is for when a microscopic examination alone cannot readily identify the cause. Full service diagnosis encompasses diseases, nematode infection, insect and arthropod pests, and disorders of plants. The clinic uses visual and microscopic examination, incubation, pathogen culturing, and virus testing via ELISA as means to determine the causes of plant problems. Relevant management options are provided based on diagnosis. Examination of soil or seed for nematode infestation (to genus level) and testing soil for presence of soil-borne pathogens (Verticillium spp. &Fusarium spp.) are available based on capacity-contact the clinic for availability.

  • Informative Examinations ($25).

A number of insect and arthropod pests, physiological disorders, and some diseases can be identified readily through visual and microscopic examination alone. Relevant management options are provided based on diagnosis.

Additional and specialty tests may require further costs.

Current ELISA testing capabilities include: Soil-borne Wheat Mosaic Virus (SBWMV), Wheat Streak Mosaic Virus (WSMV), Wheat Spindle Streak Mosaic Virus (WSSMV), Barley Yellow Dwarf Virus–PAV (BYDV-PAV), High Plains Virus (HPV), & Potato Virus Y.

Plant Pest Diagnostic Clinic

FedEx/UPS: 316 Johnson Hall,100 Dairy Rd
USPS: P.O. Box 646430
Pullman, WA 99164-6430

Label your package Perishable Plants.

Download the submission forms at: