{The Plant Disease Information Office}

The Plant Disease Information Office (PDIO) is part of the Department of Plant Pathology and Ecology of The Connecticut Agricultural Experiment Station. 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. The contact information for the PDIO is listed below:

Dr. Yonghao Li, Plant Pathologist, (

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

PDIO Hours of Operation and Holiday List

PDIO Phone: (203) 974-8601;  Toll Free in CT 1-877-855-2237

PDIO Mailing Address:
Plant Disease Information Office
Connecticut Agricultural Experiment Station
P.O. Box 1106
New Haven, CT 06504

Office Location Address (use this address for UPS and FedEx, as well as to visit):
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)


--Boxwood Blight Information--

{Boxwood blight leaf spots}

--For Children--
Coloring and Activity Books

The Experiment Station's Coloring and Activity Books for Kids are now available online in the Publications section of this PDIO website.  These books highlight many topics of plants and agriculture in Connecticut and the activities of Station scientists.  The newest edition, Coloring and Activity Book for Kids III (2011) (PDF format*), is now available.  It was edited and prepared by Dr. Sharon M. Douglas.



Newly revised and updated presentation by Sandy Anagnostakis titled Growing Chestnuts in the Northeast (PDF format*).

Some previously posted presentations from meetings are archived and can be accessed by clicking here.

*NOTE: Some of these documents are provided in Adobe® Acrobat™ (.pdf) format. If you do not have Adobe® Acrobat™ Reader to view and/or  print your these documents,  you will need to download the Adobe® Acrobat™ Reader. To get a free copy of the software, click the "Get Acrobat" image. 

{Adobe Acrobat Reader}

Content Last Modified on 9/13/2017 9:37:49 AM