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The Plant Disease Information Office

The Plant Disease Information Office (PDIO) is part of the Department of Plant Pathology and Ecology at The Connecticut Agricultural Experiment Station (CAES). The PDIO is a full-service plant disease diagnostic laboratory that assists all Connecticut stakeholders, including homeowners and professionals.  Plant samples are diagnosed utilizing molecular, serological, biochemical, and traditional diagnostic methods. The PDIO also  assists with inquiries about plants, plant identification, and plant health. Inquiries and samples can be submitted via phone, email, mail, and in person. More information can be found in the Sample Submission and  PDIO Brochure sections. 

* Due to the COVID-19 pandemic, PDIO is temporarily closed to the public in person until further notice. You can submit your samples and inquiries by mail, drop-off, email, and phone. 

Please accept our apologies for any inconvenience caused.

Contact Information
Dr. Yonghao Li, Plant Pathologist
Ms. Katherine Dugas, Plant Diagnostician
Phone: (203) 974-8601
Toll Free Phone: 1-877-855-2237

   Office Hours: The PDIO is open 8:30 a.m. - 4:30 p.m. Monday - Friday

PDIO Hours of Operation and Holiday List

Plant Disease Information Office
Jenkins-Waggoner Laboratory
The Connecticut Agricultural Experiment Station
123 Huntington Street
New Haven, CT 06511
Photo of Jenkins-Waggoner Laboratory
The Connecticut Agricultural Experiment Station's PDIO is a member of the National Plant Diagnostics Network (NPDN) and the Northeast Plant Diagnostic Network (NEPDN)