Assays offered: click on the "Specific tests" button below.

Feedback on this list is welcome. Use the "Contact us" button below.

We are here for you from 8 am - 5 pm daily (closed for lunch from 12-1).

About the Clinic

The Oregon State University Plant Clinic is a diagnostic facility that offers fee-based plant disease problem solving and specialized identification services. We also house the OSU Insect ID Clinic, which provides a free insect identification service. Home gardeners are encouraged to first consult with their local OSU County Extension office for free consultations on disease problems.

Our new address as of June 1:

Oregon State University, Botany and Plant Pathology

Attn: Plant Clinic

2701 SW Campus Way

Corvallis, OR 97331

Samples can be taken to our new location on the 2nd floor of Cordley, room 2614. Our phone number remains the same (541-737-3472).

Samples can only be accepted from 8:00 a.m. to 4:00 p.m. on weekdays.

Emerald Ash Borer

This brilliant green beetle will kill native and cultivated ash trees. Please be on the alert for dying ash trees, and if found, look for evidence of the beetle

(borer holes, adults, galleries under the bark).

For more information, please visit

Photo: Eric R. Day, Virginia Polytechnic Institute and State University,


PNW Plant Disease Management Handbook

The PNW Plant Disease Management Handbook is intended as a ready reference guide to the control and management tactics for the more important plant diseases in the Pacific Northwest.

View the Handbook