Horticulture Diagnostic Laboratories

Gardeners and ornamental horticulture professionals alike may contact our Diagnostic Labs for answers to their questions about plants, gardens, landscapes and lawns. The Labs also offer diagnostic services to help diagnose plant problems and diseases as well as identify insect and tick specimens. You can phone in questions, or drop off samples and specimens for diagnosis or identification. Our soil testing lab tests soil for pH and soluble salts. We have two locations to serve you better.

East End Location             West End Location

Cornell Cooperative Extension
Extension Education Center
423 Griffing Avenue, Riverhead, NY 11901

Office Hours: Monday through Friday - 8:30 am to 4:30 pm

Horticulture Information Line: 631-727-4126
Monday through Friday
9:00 am to 12:00 noon


Cornell Cooperative Extension
Bayard Cutting Arboretum
Montauk Highway, Great River, NY 11739

Office Hours: Thursday and Friday -10:00 am to 4:30 pm (April-October)

Horticulture Information Line: 631-581-4223
Thursday and Friday
8:45 am to 11:45 am & 1:00 pm to 4:00 pm


Directions To Our Horticulture Diagnostic Labs


Below are links to our submission forms. Please print and fill out the appropriate form and include it with your submitted samples.

 Plant Problem Diagnosis - Submission Forms (Includes instructions for submitting samples)

Herbaceous Plants (Flowers) & Ornamental Grass Problem - Submission Form

Indoor Plant Problem - Submission Form

Lawn Problem - Submission Form

Tree, Shrub, Vine, Groundcover Problem - Submission Form

Tree Fruit & Small Fruit Problem - Submission Form

Vegetable Problem - Submission Form

Insect & Plant Identification - Submission Forms (Includes instructions for submitting samples)

Insect Identification - Submission Form

Plant Identification - Submission Form

Tick Identification - Submission Forms (Includes instructions for submitting samples)

Tick Identification - Submission Form



Soil Testing Laboratory - Instructions and submission forms for having soil tested


Publication Order Forms

Cornell Cooperative Extension Publications Order Form (Pest Management Guidelines, Pesticide Manual, etc)