Washington State University

Plant Problem Diagnosis


Service Berry RustPlant Problem Diagnosis

How should you collect a sample?
---see examples on right

  • Select plant material that is showing symptoms of concern and submit various stages of the problem, especially the early stages.

  • Many problems originate belowground in and around roots-- include roots and soil for more accurate diagnosis!

  • Please do not submit dead, dry, decayed or rotted samples as they provide insufficient material for diagnosis.

What information should you provide?

  • Personal contact information (address, phone, fax, email)

  • Detailed information about the problem:
    • When was problem first noticed?
    • Is the problem spreading, and how fast?
    • How many plants are affected?
  • Detailed information about plant and its cultural care:
    • type of plant, age, condition of surrounding plants
    • site description (drainage, exposure, weather), irrigation
    • pesticide and fertilizer use (type, rate, date)

Download appropriate form:
For ornamental/ home yard plant problems, use Form C1006
For commercial crops, use Form C0084

How much does this service cost?
Information inquiries….….....…… $25
Plant problem diagnosis……...… $40

Note: Special tests may incur additional fees.

We accept payment by cash or check only. Please make checks payable to WSU Puyallup Plant Clinic.

How should you package your specimens for shipment?

  • Use a sturdy box for shipping. Wrap fleshy material (such as fruits, bulbs, or tubers) in dry paper towels or newspaper. Place roots and associated soil in a plastic bag. Include padding to prevent injury during shipping.

Where should you submit your samples?
Mail packages to:

WSU Puyallup Plant Clinic
2606 West Pioneer
Puyallup, WA 98371-4998

Please DO NOT mail on a Friday or before any national holiday because the specimens may deteriorate in transit or over the weekend.

In person: The Plant Clinic is open Monday through Friday from 8:00 am to 4:30 pm.

Click here for map and directions.





Wilting, yellowing, or dieback: Dig up and submit whole plants (with roots).

Potted plants: Send the whole plant, including roots and soil.

Fruit, leaves, flowers, twigs or branches: Send specimens showing diseased and healthy tissue.

Vascular wilt of trees (Verticillium wilt or Dutch elm disease): Send several branch sections that are ½ to 1 inch in diameter and about 8 inches long from branches with wilting or yellowing leaves.

Puyallup Research and Extension Center, 2606 West Pioneer, Puyallup WA 98371-4900, 253-445-4500, Contact Us