Horticulture Diagnostic Lab

Horticulture Diagnostic Lab:

The Horticulture Diagnostic Lab, run by Master Gardener volunteers, can identify plants and insects and diagnose plant diseases or damage caused by insects. 

Samples are accepted by appointment only. 

Call 845-677-8223 Ext 115, to set up a drop-off time.

Diagnostic results may take up to 7-10 business days.

We do not accept any samples by mail. 

Sample Collection:

Plants:

• All samples must be in a sealed plastic bag to be accepted.
• Roots should be bagged separately from branches, shoots, or foliage.
• Collect samples before pesticide application for accurate diagnosis.
• Take samples from areas with early symptoms. Do not bring in dead plant material.

Insects:

• Insects must be in a sealed plastic bag or sealed container to be accepted. 
• After collecting the insect sample, place it in the freezer.

Fees:

• Insect or plant identification: $20.00 per sample, CASH OR CHECK ONLY
• Diagnose plant damage/disease: $20.00 per sample, CASH OR CHECK ONLY
• Rutgers Soil Sample Kits $25.00 per sample, CASH OR CHECK ONLY

All samples must include the submission form and payment for analysis. We cannot not process samples until we have received payment in full. We accept Cash and Check. Click the button to download your form:

Horticulture Hotline:

Our Master Gardeners also operate our Horticulture Hotline, (845) 677-5067, which is open from April through September on Mondays and Wednesdays from 9 am to 12 pm. During inclement weather and travel restrictions, it may not be staffed.

Click here for general tips on identifying plant diseases.  These tips will help you gather the information needed before calling our hotline or emailing in with questions.

Ask Extension:

Written questions can also be submitted at Ask Extension. Look for the Ask a New Question button, then select New York from the dropdown menu, and then finally select the county closest to you. If a photograph is included, please ensure it is in focus and as close-up as possible. These questions will be answered by our Master Gardener volunteers. Please allow 7-10 days for a response.

Cornell Diagnostic Services:

More information can also be found at Cornell University Diagnostic Services:

• Cornell University Insect Diagnostic Laboratory
• Cornell University Plant Disease Diagnostic Clinic

Gardening Information:

• Visit the Cornell Garden Based Learning Website to learn more about vegetables, fruits, lawns, trees, shrubs, houseplants, soil, composting and pests.
• New York State Integrated Pest Management for Communities for structural and garden pests.
• Websites for Gardeners  - many topics, including bees, nuisance wildlife, mushrooms, invasive plants, certified arborists and weed ID. 

Last updated October 6, 2025