Greenhouse Update - April 10, 2006
Leanne Pundt, Extension Educator, University of Connecticut
| Two–spotted spider mites –
continue to appear on favorite plants including New Guinea
Impatiens, Scaevola, Ipomoea “Blackie” and “Tricolor”. Closely
inspect hanging baskets, especially in hot, dry areas. See
March 20th update for
more information on managing spider mites. |
|
 Mite damage to scaevola L. Pundt photo click for a larger image |
|
| Thrips – have been found on
hollyhock, verbena, New Guinea Impatiens, scaevola, fuchsia and
thunbergia to name a few. See March 20th
update for more information. |
|
 Thrips damage to dahlia foliage. Note white scarring. L. Pundt photo click for a larger image |
Thrips damage to verbena L. Pundt photo click for a larger image |
| Shore fly adults are a
nuisance and are starting to appear near algae on the surface of
growing media. Some growers use larger yellow
sticky cards or sticky tape to trap out adults. Contact sprays
of horticultural oil or
insecticidal soap can also be used against the adults. Treat in
the morning or late in the day when the adults are settled so you
are more likely to contact the adults. (Follow all safety
precautions on the label when using these materials). The long-term
solution is to prevent algae growth –
see March 3rd update. |
|
 Adult shoreflies L. Pundt photo click for a larger image |
|
| Sunscald – was evident on tender young growth as plants were moved from propagation areas into warmer houses with no shade cloth on sunny days. Tender growth was bleached white with no signs of spider mites or thrips. | |
| Botrytis Blight – is
starting to appear on Diascia, New Guinea Impatiens, Geraniums, and
other susceptible crops. Water early in the day, and heat and vent
as needed to reduce relative humidity levels. Spacing plants further
apart also helps to reduce humidity levels. Sanitation is crucial –
remove severely infected plants, spent blossoms and cover garbage
cans. Botrytis spores are readily spread through a greenhouse by
water splash and air currents. Before cleaning up plants, apply
fungicide sprays to help protect healthy plants from the Botrytis
spore release that occurs as plants are handled and watered. If
disease pressure is high, apply protectant fungicides such as
Decree, Daconil or Chipco. If disease pressure is less severe, other
options include Compass, Heritage or Dithane to name a few. (Consult
and follow fungicide labels for registered uses.) For more
information see:
http://www.ipm.msu.edu/CAT02_land/L05-17-02.htm#4 |
|
 Botrytis on New Guinea Impatiens L. Pundt photo click for a larger image |
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|
Previous 2006 UConn IPM Greenhouse Updates |
| 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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|
GREENHOUSE IPM COORDINATOR (commercial interests and growers) |
LEANNE PUNDT | 860-626-6240 |
| . | . | . |
|
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