The Plant Clinic and Insect Identification Services are open 8:00 - 4:00 p.m.

About the Clinic

We are a diagnostic facility that offers fee-based plant disease problem solving and specialized identification services. Home gardeners are encouraged to first consult with their local OSU County Extension office for free consultations on disease problems.

We also house the OSU Insect ID Clinic, a free insect identification service.

Our address:

Oregon State University, Botany and Plant Pathology
Attn: Plant Clinic
2701 SW Campus Way
Corvallis, OR 97331

Dahlia problems? Get the facts!

Dahlia growers concerned about leafy gall disease: Check out our information at


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