Welcome to the virtual OSU Plant Clinic. We are happy to be here for you!


For the safety of all involved, we request that packages be sent via mail or express delivery if at all possible. Please send us the shipper and tracking number if you ship via an express delivery service so we can track packages and ensure they are delivered quickly from our central University mailing service. If samples are too large to be delivered, please drop them off, with a completed sample form at the NORTH loading dock (accessible from Orchard Ave) of Cordley hall (map view). Please call us (541-737-3472) to let us know a sample had been dropped off, and we will come get it.

Samples can only be accepted from 8:00 a.m. to 4:00 p.m. on weekdays. Please allow extra time for sample processing.

These measures are being instituted to be in agreement with the University's policies, and to keep our customers and employees safe.  We very much appreciate your cooperation!

Invasive Box Tree Moth Confirmed in the United States

A new pest of boxwood has entered the country: the box tree moth. This insect is not yet in Oregon, but it is worth being on the lookout for, since it is highly destructive to boxwood plants. Please read more at the USDA APHIS website.

Photo by Matteo Maspero and Andrea Tantardini, Centro MiRT - Fondazione Minoprio

Crown gall in dahlia?

The Plant Clinic has extensive experience diagnosing crown gall and leafy gall in all sorts of crops! For more information, use our "PLANT DISEASES" pull-down menu (above) and investigate Crown gall and Leafy gall articles.


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.

Photo by Lynn Ketchum at Oregon 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. This reference is updated twice annually, providing accurate, unbiased information.

View the Handbook