Plant Diagnostic Lab

  • close-up of plant leaf

Results from trusted professionals

Reach out with any questions to unh.pdl@unh.edu or 603-862-3043. 

  • No cannabis samples.
  • If you are interested in a particular molecular test, please contact the lab first to see if it is available. 
  • Expect 7-10 business days for results.  Reports will be emailed to the address provided on the form.  Be sure to check your spam folder for the report and call/email with any questions! 

Each sample must include a sample submission form and the $20 sample fee. 

Download Sample Submission Form

Getting Your Samples to Us

Mail
UNH Plant Diagnostic Lab
Barton Hall
34 Sage Way
Durham, NH 03824

Drop Off

Barton Hall is open to the public daily from 8 a.m. - 5 p.m. Monday-Friday.  Follow the signs & head upstairs to Barton 206.  You may leave your plant sample with a form with anyone in the lab OR leave it in the blue sample drop off boxes outside of the lab door. 

 Do not drop off plant samples in the soil drop off box outside of Barton Hall.  We are unable to process plants samples from that box because they degrade too quickly. 

Articles

Tyler Edwards in lab
Welcome Tyler Edwards
Tyler Edwards Joins Extension as the Plant Pathology Program Manager
UNH Extension is pleased to announce the hire of Tyler Edwards as the Plant Pathology Program Manager. Learn More
UNH Extension Can Help You Diagnose Plant Problems
UNH Extension Can Help You Diagnose Plant Problems
What do you do when you encounter a plant problem such as disease or abnormal growth in the landscape? You or a client may find a problem occurring w... Learn More
Bo Liu portrait
Welcome Bo Liu
Bo Liu, Ph.D., joins UNH Extension as the Director of the UNH Plant Diagnostic Lab and State Extension Specialist
UNH Extension is pleased to welcome Bo Liu, Ph.D., as our Plant Diagnostic Lab Director and State Specialist. Learn More
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Events

Resources

Gibbera twig blight shows black spots, stromata, with red margins
Gibbera twig blight
Gibbera twig blight is known to affect blueberries in Merrimack, Sullivan, Cheshire and Grafton counties of New Hampshire. This disease will affect fr... Learn More
Black growth on hellebore plant
Black Death of Hellebore
Black death of hellebore, a virus disease affecting hellebores in nursery and home gardens, was found in a nursery in Grafton County, New Hampshire, i... Learn More
Leaf rust spots on the underside of blueberry leaves; spots have a distinct brown edge with typical yellowish orange rust pustules
Blueberry Leaf Rust
In the summer and fall of 2023, blueberry leaf rust was found widely distributed in New Hampshire, including Merrimack, Hillsborough and Strafford cou... Learn More
Exobasidium fruit spot on harvested blueberries
Exobasidium leaf and fruit spot of blueberry
Exobasidium leaf and fruit spot of blueberry is a fungal disease affecting both leaves and berries. Symptoms matching this disease were reported in se... Learn More
Yellow and green leaves with brown spots
Cherry Leaf Spot
Leaf spot is one of the important fungal diseases on cherry trees in the United States. The disease mainly affects the leaves; the pathogen will cause... Learn More
Celery with anthracnose showing leaf curl symptom
Celery Leaf Curl - Anthracnose
Several celery samples from high tunnel production with leaf curl have been identified by the UNH Plant Diagnostic Lab; this disease causes significan... Learn More

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