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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. 

Contact Information
Dr. Yonghao Li, Plant Pathologist
Phone: (203) 974-8601
Toll Free Phone: 1-877-855-2237
Sample Submission(Sample submission form and guidelines)
Publication(Fact sheets and other publications)
What's New(Disease alert and updates) 
Image Gallery(Common plant diseases and linked fact sheets) 
Boxwood Blight(Fact sheets and updates)

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

PDIO Hours of Operation and Holiday List

Plant Disease Information Office
Jenkins-Waggoner Laboratory
Connecticut Agricultural Experiment Station
123 Huntington Street
New Haven, CT 06511
Photo of Jenkins-Waggoner Laboratory

The Experiment Station's PDIO is a member of the National Plant Diagnostics Network (NPDN) and the Northeast Plant Diagnostic Network (NEPDN)