Greenhouse Update - May 22, 2006
Leanne Pundt, Extension Educator, University of Connecticut
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Botrytis Blight – due to the severe disease pressure, Botrytis blight developed on many susceptible greenhouse crops such as geraniums, diascia, bacopa, petunia, fuchsia and many, many others.
Rhizoctinia web blight - The humid conditions also encouraged the development of rhizoctonia web blight on dense, closely spaced plants such as garden impatiens, coleus, dahlia, etc. Rhizoctonia is more commonly known as a fungus that causes root rot diseases. It is generally more active in the upper portion of the growing media than Pythium. So, it may grow up from the media causing web blight during favorable environmental conditions. Stems and leaves collapse, with fine, web-like mycelium present. If you look closely, you can see the fine strands of the fungus. You will not see the powdery, gray mold that you see with Botrytis Blight infections.
Rhizoctonia is soil borne, and has a wide host range. It may be more common on bedding plants grown on the greenhouse floor, although I have also seen web blight on plants grown on benches and even on hanging baskets! If there are certain houses or locations where you have seen outbreaks of Rhizoctonia web blight, consider trying to grow crops that are less susceptible to Rhizoctonia web blight in those locations. (These may just be those crops that form a less dense canopy). I tend to see web blight in the some locations and on the same crops year after year. Many of the fungicides labeled for Rhizoctonia root rot may also be helpful in limiting web blight.
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Previous 2006 UConn IPM Greenhouse Updates |
| May 9, 2006 |
| May 1, 2006 |
| April 24, 2006 |
| April 15, 2006 |
| April 10, 2006 |
| April 3, 2006 |
| March 27, 2006 |
| March 20, 2006 |
| March 3, 2006 |
| February 25, 2006 |
| February 17, 2006 |
| January 31, 2006 |
If you would like to receive an email notice when new greenhouse updates are posted on the website, please email me at: leanne.pundt@uconn.edu . This will be an undisclosed list, and your email address will remain private.
| New England Greenhouse Update now online. University Extension Specialists in New England, in conjunction with USDA's Northeast Sustainable Agriculture Research and Education, contribute information to this new website. Timely updates are provided for commercial growers of greenhouse crops and flowers in Massachusetts, Connecticut and Rhode Island. You can use this additional resource for more information about current observations and recommendations on environmentally safe production practices. |
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GREENHOUSE IPM COORDINATOR (commercial interests and growers) |
LEANNE PUNDT | 860-626-6240 |
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