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The C. Wayne Ellett Plant and Pest Diagnostic Clinic at Ohio State University specializes in the identification of plant diseases, plant health problems, insects and insect related problems.  The CWEPPDC offers a broad spectrum of testing to idenfiy pests and plant diseases.  Diagnosticians collaborate with specialists in plant pathology, entomology, horticulture, agronomy, natural resources, and other areas to identify pests, plant diseases, and cultural and environmental problems of plants.

If you wish to submit a digital sample or send photos to accompany a physical sample, please send an email to with photos, a clear description of the plant, information about the symptoms seen on the affected plant, and if you are sending a physical sample.

Please select a category on the left-hand side of the screen that best fits your sample type for detailed sampling instructions.