University of Maine Cooperative Extension Plant Disease Diagnostic Lab

The Plant Disease Diagnostic Lab is part of the Pest Management Unit within the UMaine Extension Diagnostic and Research Laboratory.  The lab is also a part of the National Plant Diagnostic Network. Submissions to the Plant Disease Diagnostic Lab must include your name, phone number, business name, county, host plant, problem, date when symptoms were noted, and good, in-focus images.

Complete and submit the Plant Disease Diagnostic Submission Form and Guidelines (PDF) for physical plant samples.

We also accept digital images sent by email (view the video below) but we may ultimately need a physical sample in order to make a definitive identification.

Note: Please expect 5-10 business days after sample arrival for diagnosis. A report detailing the diagnosis and management recommendations will be sent via email (if provided) for each sample. The subject title of this report will read “UMaine Plant Disease Diagnostic Lab Report; ******. Please check your spam folder if you suspect you have not received this report and select “Not Spam” so that future reports will go into your inbox. Most spam folders self-delete following 30 days; if this is the case and you cannot find your report, please contact us to resend it.

Important Announcement

Starting August 12, 2022, the lab will temporarily stop receiving plant samples for diagnostics and will fully transition to research efforts for the remainder of 2022 and then return to business as usual in 2023. If the lab receives a sample after August 12, 2022 we will not be able to forward it to another lab, and you will have to re-send a new sample to another diagnostic lab due to the diminished integrity of the plant. We will return to our full diagnostic services by the start of the 2023 season. If you have questions regarding this temporary change in procedure, please contact Mark Hutchinson at Thank you for your understanding.

Maine Residents:

New Hampshire Residents:

  • The University of New Hampshire Plant Diagnostic Lab is reopening on August 15, 2022, at which point we suggest working with them as you did prior to June 2021. At that time, the University of Maine lab took over receiving samples for UNH while they were going through transitions of their own.

Diagnostic Lab Personnel:

  • Dr. Alicyn Smart, DPM — Plant Pathologist and Director of the Plant Disease Diagnostic Laboratory
  • Dr. Stephanie Shea, Ph.D. — Assistant Diagnostician
  • Ruby Bonilla — UMaine undergraduate student, Lab Technician III
  • Sarah Dorey — UMaine undergraduate student, Lab Technician III
  • Sydni Plummer — UMaine undergraduate student, Lab Technician I
  • Ross Sousa — UMaine undergraduate student, Lab Technician I

Additional Resources:


8:00 a.m. – 4:30 p.m., Monday-Friday (closed holidays)


We are located at 17 Godfrey Drive in Orono, Maine, just off from Interstate 95, Exit #193 (not far from the Black Bear Inn).

Donate to UMaine Extension’s Plant Disease Diagnostic Lab

VIDEO: How to submit plant disease samples via email:

University of Maine Cooperative Extension Plant Disease Diagnostic Laboratory accepts samples of plants with symptoms of disease or possible disease by mail or by email with illustrative photos.

This short video explains the process for submitting samples in need of diagnosis by email.