The Plant Disease Information Office (PDIO) is part of the Department of Plant Pathology and Ecology of The Connecticut Agricultural Experiment Station. Dr. Sharon M. Douglas, Plant Pathologist and Head of this Department (Phone 203.974.8496, Email Sharon.Douglas@ct.gov), oversees these service efforts. 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.
A brochure about the Department of Plant Pathology and Ecology is available (346 kb, 2 pages, PDF format*).
Dr. Yonghao Li, plant pathologist, (Yonghao.Li@ct.gov) is responsible for the office with the assistance of Ms. Mary K. Inman, horticultural technician, (Mary.Inman@ct.gov).
***PLEASE NOTE: The Plant Disease Information Office has been temporarily relocated to Jones Auditorium due to the renovation of Jenkins Laboratory. Jones Auditorium is located directly across from Jenkins and is accessible to all by elevator and stairway. Office hours are Monday-Friday, 8:30 a.m.- 4:30 p.m. If you have any questions, please call 203.974.8601 or 203.974.8606. Thank you for your patience.***
The Experiment Station's PDIO is a member of the National Plant Diagnostics Network (NPDN) http://www.npdn.org.
Link to BOXWOOD BLIGHT PAGE
-Begin to Scout for Impatiens Downy Mildew-
Last year impatiens downy mildew was confirmed in many residential and commercial landscapes throughout Connecticut. This disease is caused by Plasmopara obducens, a fungus-like organism (also called a water mold or oomycete). All cultivars of the common garden impatiens, Impatiens walleriana, are susceptible. However, New Guinea impatiens appear to be tolerant to downy mildew. This pathogen does not infect cucumbers or squash (or any vegetable) or any other common bedding plants. The downy mildew pathogen is spread by infected plants, water/rain, and wind. It can splash from plant-to-plant within a landscape bed or can be airborne and travel over much longer distances. Early symptoms of downy mildew begin as light-green yellowing, mottling, or stippling and often go unnoticed. These symptoms are often mistaken for nutrient imbalances or spider mite infestations. Advanced symptoms include stunting of whole plants, leaves, and flower buds, downward curling of leaves, wilting, plant collapse, and severe defoliation that results in bare, leafless stems.
Downy mildew is particularly destructive under moist conditions and cool nights--just the weather we have recently been having throughout the state.
Impatiens downy mildew--note stunted plants with distorted leaves.
Subtle chlorosis and twisting of leaves of impatiens with downy mildew.
Any suspicious impatiens samples should be sent or brought to The Plant Disease Information Offfice for examination and diagnosis as soon as possible.
IF downy mildew is diagnosed on your plants, all infected plants should be dug (roots included) and placed into municipal trash, when acceptable. Infected plants should not be composted.
If you have any concerns or want more information about this destructive disease, please call The Plant Disease Information Offfice at 203.974.8601.
-Late Blight Reported in MA-
-Scout for Late Blight of Tomato and Potato-
Late blight was confirmed in Franklin County, MA on tomato on 11 July 2013 and in Erie County, NY on tomato on 10 July 2013. The recent weather has been very favorite for this disease of tomato and potato, so it is important to scout for this destructive disease. It is very important for commercial growers and home gardeners to be on the lookout for late blight in their fields and community or backyard gardens. Information on this important disease can be found in the fact sheet Late Blight of Tomato and Potato in Connecticut--2012 (820 kb, 7 pages, PDF format*).
Any suspicious tomato or potato samples should be sent or brought to The Plant Disease Information Offfice for examination and diagnosis as soon as possible.
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) (599 kb, 10 pages, PDF format*), is now available. It was edited and prepared by Dr. Sharon M. Douglas.
--Archived Disease Alerts--
Disease Alert- Downy Mildew of Impatiens (August 2012)
Disease Alert- Late Blight of Tomato and Potato (June 2012)
JUST POSTED (22 July 2013)--
Presentation from the CTPA Summer Meeting 2013 by Bob Marra titled Tropical Storms, Hurricanes, and "Superstorms": Impacts and Influence on Tree Diseases (5,348 kb, 83 pages, PDF format*).
Presentation from the CNLA Summer Meeting 2013 by Sharon Douglas titled Boxwood blight, downy mildews, and other diseases of 2013 (1,798 kb, 21 pages, PDF format*).
Newly revised and updated presentation by Sandy Anagnostakis titled Growing Chestnuts in the Northeast (6128 kb, 48 pages, PDF format*).
Some previously posted presentations from meetings are archived and can be accessed by clicking here.
22 July 2013 (updated)
*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.
Content Last Modified on 7/22/2013 11:29:00 AM