Diseases

February Pest Message

Week of February 20, 2012

Here is what is happening in greenhouses this week, courtesy of Leanne Pundt, UConn and Jim Mussoni, IPM Scout.

Monitor carefully for the following pests:

  • Thrips in thunbergia and fuchsia
  • Aphids in fuchsia 'Dark Eyes' (they seem to like this variety)
  • Thrips and aphids in sweet potato vine
  • Aphids on lilies
  • Aphids on many types of herbs

Botrytis has been seen on slow to grow cuttings of Helichrysum (Licorice) and Rosemary.

April Pest Message

Pest Message, Week of April 9, 2012

Here is what is happening in greenhouses, courtesy of  Jim Mussoni, IPM Consultant, Leanne Pundt, UConn, Tina Smith, UMass and Bess Dicklow, UMass Diagnostic Laboratory

Botrytis

Botrytis blight is starting on closely spaced susceptible plants such as Nemisia, Bacopa, Calibrachoa, Begonias and many others. Closely spaced plants also have lower leaves that are starting to yellow and senesce so are more susceptible to potential infections. Flower drop from hanging baskets, which is very common now, can also encourage Botrytis on crops growing below on the benches or floors. Tender flowers, leaves and stems are often infected.

Late Blight on Tomato Update

Late Blight caused by Phytophthora infestans has been confirmed by the UMass Extension Plant Diagnostic Lab in Middlesex and Norfolk Counties in Massachusetts. Late blight was also confirmed by Connecticut Agricultural Experiment Station plant pathologists on potted tomatoes that were purchased by a homeowner in New Haven County, Connecticut (20 June 2012).

(update July 13, 2012 - Late blight has been confirmed in Franklin county, MA today. Tomatoes were grown from seed on-farm. The source fo the inoculum is unknown)

Impatiens Downy Mildew - Fungicide Program

Are you growing garden impatiens this year? This is a frequent topic of conversation among growers as everyone struggles with this decision.  Some are not growing garden impatiens, many are reducing their numbers (by 30% - 70%), and some are continuing as in years past.  There are many unknowns for the upcoming growing season in terms of disease pressure and the amount and sources of disease inoculum – both in the greenhouse and in garden beds.  However, if we are growing garden impatiens, we are growing a Downy mildew susceptible crop in a high risk area.

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