The wet and humid conditions are encouraging many different diseases.
Rust diseases Growers are familiar with the typical orange to rust colored spores on the underside of the leaves. However, rust diseases can be very difficult to control, especially during production.
For more information, see
Update on Rust Diseases and their Control by Ann Chase
http://www.chasehorticulturalresearch.com/pdfs/5_09_9.pdf
Powdery Mildews the humid conditions have lead to powdery mildew on the usual targets such as phlox, monarda, eupatorium etc. Fortunately, powdery mildew is easy to recognize, but its important to scout regularly, especially inspecting the lowermost leaves where it is easily overlooked.
However, powdery mildew can fool you on crops such as Sedum. From a distance, the brown scab-like lesions look like some type of spray injury or perhaps a leaf spot disease. Look closely for the fine, white fungal threads and chains of spores from the powdery mildew fungus. (See photo)
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Powdery mildew on sedum |
Spider mites have been increasing in the greenhouse on susceptible crops such as butterfly bush. (Buddleia plants outdoors in the field or garden are less likely to be infected, with lower outdoor temperatures and hopefully the presence of beneficial predatory mites).
| July 8, 2009 |
| June 26, 2009 |
| May 13, 2009 |
| April 28, 2009 |
| April 8, 2009 |
| March 23, 2009 |
| February 4, 2009 |
| 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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