Greenhouse Update - June 5, 2006
Leanne Pundt, Extension Educator, University of Connecticut
Spittlebugs – and their damage have been occurring on various herbaceous perennials and herbs as they move in from grassy areas surrounding protection areas. Look for the white foam surrounding the small, light green spittlebug nymphs. This foam helps the nymphs stay moist during hot, sunny conditions and protects them from predators. Most of the damage is only cosmetic due to the spittle masses. With small infestations, a forceful jet of water can be used to dislodge the nymphs.
Spittlebugs and their damage
Leanne Pundt photo click for a larger image
Tortoise Beetles – are fairly small, (less than ¼ of an inch long), turtle-shaped beetles that can be dull orange, green or shiny gold – like a piece of jewelry. They can be found feeding on plants in the morning glory family such as Morning Glory, Moon flower, Cardinal Climber and Sweet Potato Vine – especially the variety Marguerite. Look for distinct round holes on the leaves of susceptible plants. If left unchecked, leaves will be riddled with holes as both the adults and larvae will feed on the leaves. Insecticides labeled for leaf-feeding beetles such as Orthene or Conserve may be used. Marathon (imidacloprid) may also provide control when applied as a systemic.
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Leanne Pundt photos -- click for a larger image |
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Daylily Leaf Streak – is occurring on susceptible cultivars of Hemerocallis. Look for a central yellow streak along the leaf midvein that often starts at the tip of the leaves. Small, reddish brown flecks and brown sunken spots develop on sunken tissue. Proper plant spacing, and watering early in the day helps to keep leaves dry. Several different fungicides are labeled for leaf spot diseases including thiophanate methyl (Cleary's 3336 or Fungo Flo), myclobutanil (Eagle), or chlorothalonil (Daconil, Pathguard) or azoxystrobin (Heritage). At the end of the season, remove infected leaf debris. Do not confuse this fungus disease with Daylily Rust.
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Daylily streak |
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Septoria Leaf Spot – has been occurring on susceptible cultivars of Phlox. Look for grayish leaf spots with black, pepper-like spore cases that are surrounded by a purple border. Infections often begin on the lower leaves and move up the stem. Cultural practices used to manage Botrytis blight will also help manage leaf spots. Protectant fungicides containing chlorothalonil, mancozeb will also help.
Plan on starting preventative applications of labeled fungicides on Rudbeckia for Septoria Leaf Spot starting in mid- June.
Septoria leaf spot
Leanne Pundt photo - click for a larger image
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Previous 2006 UConn IPM Greenhouse Updates |
| May 22, 2006 |
| 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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Information on our site was developed for conditions in the Northeast. Use in other geographical areas may be inappropriate.
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.
