Greenhouse Update - May 9, 2005
Leanne Pundt, Extension Educator, UConn
Aphids continue to plague growers. See previous updates for more information.
Bacterial Leaf Spots have been occurring on certain varieties of verbena. Don't confuse this disease with powdery mildew or with fungal leaf spots. Splashing water easily spreads bacterial diseases. Avoid overhead irrigation to help keep leaves dry. If only a few plants are severely affected, one option is to toss those plants. Then apply copper based fungicides such as Phyton 27, Kocide or Camelot (See labels for information on plant safety and precautions).
Bacterial Leaf Spot on Verbena
photo by L. Pundt
click for a larger image
Bacterial Leaf Spot has also been occurring on peppers. Peppers can become infected when grown from seed containing the pathogen or when exposed to the bacteria from another source such as solanaeous weeds or crop debris. Rogue infected plants.
Bacterial Leaf Spot on peppers
photo by L. Pundt
click for a larger image
Copper based fungicides can be applied to protect the rest of the crop. Many different copper based fungicides are labeled for use on vegetable transplants including Champ, Kocide, and Camelot.
In addition, there are pepper varieties resistant to bacterial leaf spot. See the following fact sheets under the Vegetable IPM website for more information on this disease:
Shore flies populations have build up this past week. Larvae and adult shore flies are found near algae, their food source. They do not feed on plants, but can become a nuisance. If heavy infestations develop, their fecal droppings on the plants can become unsightly.
Shore fly adults
photo by L. Pundt
click for a larger image
Avoid overwatering, and over-fertilizing, which contribute to the buildup of algae. Mass trapping of adults with yellow sticky tape may also be an option.
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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