Greenhouse Update - April 15, 2006
Leanne Pundt, Extension Educator, University of Connecticut
physiological disorder, has been observed on various
cultivars of Ipomoea, Cleome, Cuphea, and Ivy
Geraniums. Symptoms vary depending upon the plant
species affected. On Ipomoea, white, crusty
eruptions, like a grain of salt, develop along the leaf
veins. On ivy geraniums, water-soaked swellings on the
underside of the leaves later turn brown and corky.
For more information, and a slide show of symptoms See the fact sheet Non-infectious plant disorder, oedema on the Greenhouse IPM Web site.
However, if mites feed on ivy geraniums, the plants develop oedema-like symptoms that spread to the youngest leaves, as the spider mites migrate to those younger leaves. (Stippling from spider mite feeding doesnt occur on ivy geraniums). Look on the underside of the leaves, near the veins, for any signs of two-spotted spider mites.
Ringspot symptoms on Geraniums Ringspot symptoms on geranium may be the result of either tomato or tobacco ring spot virus. New leaves produced from midsummer on generally do not show symptoms, as the plants grow more rapidly. Plant viruses are relatively common in geraniums; however, in most cases they are not responsible for any major economic damage with the plants remaining sellable.
article for more information:
Broad Mites may occur on a number of ornamental crops including Gerbera, New Guinea Impatiens, Salvia, and Verbena to name a few. Growers often see the characteristic symptoms of injury, but rarely the mites themselves because they are so small. Characteristic symptoms include leaf edges curling downward and distorted flowers or buds that do not open. Terminal buds may also be killed.
Broad mite injury is often confused with herbicide injury, nutritional (boron) deficiencies, or physiological disorders.
Not all miticides labeled for spider mites are labeled for broad mites. Translaminar miticides such as Avid, or Pylon may be used on ornamental crops infested with broad mites.
Contact miticides such as Kelthane, Sanmite or Akari (see supplemental label at www.sepro.com) are also labeled.
Repeated applications are often needed to manage broad mites because they are so hard to contact with foliar sprays as they feed on the underside of the leaves and deep within the buds and flowers. Consult labels for registered uses and plant safety information.
If only a small number of plants are infected, and they are detected early, growers may consider rogueing infested plants
L. Pundt photo click for a larger image
|Broad mite damage on
L. Pundt photo click for a larger image
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Previous 2006 UConn IPM Greenhouse Updates
|April 10, 2006|
|April 3, 2006|
|March 27, 2006|
|March 20, 2006|
|March 3, 2006|
|February 25, 2006|
|February 17, 2006|
|January 31, 2006|
|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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