Inspect Incoming Poinsettia Cuttings- for presence of insects (whiteflies, fungus gnat larvae), as well as general health and vigor. Many growers have noted that applications of biological fungicides such as RootShield WP help to improve root health while preventing root rot diseases such as Pythium, Rhizoctonia, Fusarium and Thielaviopsis. For more see www.bioworksbiocontrol.com
Fungus gnat larvae – can quickly impair the growth of poinsettia roots. Inspect incoming cuttings for signs of fungus gnat feeding (blunt root tips), or the presence of the black headed larvae. If you are growing poinsettias in houses with a past history of fungus gnat issues due to poor drainage, standing water, dirt floors etc. preventative treatments within 10 days of potting are a good idea. Many different materials are available for treatments (See latest issue of New England Greenhouse Floriculture Guide).
Beneficial nematodes (Steinernema feltiae) (Nemasys, NemaShield, and Scanmask) can be applied to moist growing media, with temperatures between 50-90F. Remove screens and filters from sprayers. Apply on cloudy, overcast days because nematodes are sensitive to ultra-violet light and desiccation. Insect growth regulators such as Distance (carefully read safety precautions on label), Citation, Ornazin or Enstar may also be used. Repeated applications of Gnatrol (BT) are often needed because it works best against the first instar larvae. (3 applications at the highest rate are often needed). Although the Group 4A materials works well (especially Safari, according to recent university trials), you may want to reserve their use for whiteflies, especially the Q biotype.
Late Blight on Greenhouse Tomatoes – Jude Boucher observed late blight on greenhouse tomatoes. For more see Vegetable Pest Message.
| July 17, 2009 |
| 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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GREENHOUSE IPM COORDINATOR (commercial interests and growers) |
LEANNE PUNDT | 860-626-6240 |
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The information in this material is for educational purposes. The recommendations contained are based on the best available knowledge at the time of printing. Any reference to commercial products, trade or brand names is for information only, and no endorsement or approval is intended. The Cooperative Extension system does not guarantee or warrant the standard of any product referenced or imply approval of the product to the exclusion of others which also may be available.All agrochemicals/pesticides listed are registered for suggested uses in accordance with federal and Connecticut state laws and regulations as of the date of printing. If the information does not agree with current labeling, follow the label instructions. The label is the law.Warning! Agrochemicals/pesticides are dangerous. Read and follow all instructions and safety precautions on labels. Carefully handle and store agrochemicals/pesticides in originally labeled containers immediately in a safe manner and place. Contact the Connecticut Department of Environmental Protection for current regulations.The user of this information assumes all risks for personal injury or property damage.Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Kirklyn M. Kerr, Director, Cooperative Extension System, The University of Connecticut, Storrs. The Connecticut Cooperative Extension System offers its programs to persons regardless of race, color, national origin, sex, age or disability and is an equal opportunity employer.