July 2009


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Wendy Sue Harper <[log in to unmask]>
Reply To:
Vermont Vegetable and Berry Growers <[log in to unmask]>
Wed, 15 Jul 2009 12:31:48 -0400
text/plain (102 lines)
I am pretty sure a gardener in Fairfield also may have it--based on his
descriptions. His plants came from Connecticut and NJ.


Wendy Sue

Wendy Sue Harper, Ph.D.
Vegetable and Fruit Advisor

Providing Technical Assistance for Farmers, Apprentices, and Gardeners

Northeast Organic Farming Association of Vermont
PO Box 697
Richmond, VT 05477
(802)434-4122 phone
(802)434-4154 fax
[log in to unmask]

> Newfane (southern VT) but also sounds like Jake has it and Pooh Sprague
> across the river in Plainfield NH. several gardeners in Bethel area and
> other
> central VT locations (Verbally confirmed only but sure sounds like it)
> Mimi Arnstein wrote:
>> Where is it being reported in VT?
>> Mimi Arnstein
>> Farmer
>> Wellspring Farm
>> Marshfield, VT
>> http://www.wellspringcsa.com
>> -----Original Message-----
>> From: Vermont Vegetable and Berry Growers
>> [mailto:[log in to unmask]] On Behalf Of Vern Grubinger
>> Sent: Wednesday, July 15, 2009 11:51 AM
>> To: [log in to unmask]
>> Subject: late blight red alert
>> Late blight is now confirmed at multiple locations in Vermont as well as
>> in every other northeast state. It appears to be spreading rapidly. Hot
>> dry weather may help slow it but cool mornings mean dew on the plants
>> which is not good. Many homeowners are now reporting symptoms of the
>> disease as well. Here are condensed recommendations, adapted from UMass
>> Extension:
>> Fields with significant disease should be burned down with herbicide or
>> plowed under ASAP. Each infected field is producing spores that will
>> move to other farms in the area. Fields showing little or no symptoms
>> should be protected as follows with fungicides, which are the only
>> practical tool for managing late blight this year. Destruction of all
>> infected plant material will help manage the disease for next year since
>> it needs plant tissue to overwinter. Be especially vigilant about
>> digging all infected tubers and destroying, or burying deeply.
>> Fungicides - Conventional.
>> Protectant sprays work well, with chlorothalonil (ie. Bravo or
>> comparable material) continuing to provide excellent control. However if
>> you are late in getting either a chlorothalonil, metiram or mancozeb
>> spray on, then the combination of Curzate (cymoxanil, fungicide group
>> 27) mixed with a protectant is helpful to provide some kickback
>> activity. Curzate works well when plants are actively growing and
>> temperatures are cool, conditions that exist now for both potatoes and
>> tomatoes. Previcur Flex has similar activity, and should be mixed with
>> chlorothalonil. The pathogen has developed resistance to some fungicides
>> such as metalaxyl and mefenoxam (Ridomil, Ridomil Gold), so these are no
>> longer effective. If environmental conditions remain conducive for late
>> blight, apply a fungicide from a different mode of action class every
>> 5-7 days such as Ranman, Forum, Tanos, Gavel, Reason (each mixed with a
>> protectant), Revus Top,or a phosphorous acid fungicide (ProPhyt,
>> Fosphite, Phostrol).
>> Fungicides - Organic.
>> There are some OMRI (Organic Material Review Institute) approved
>> products that list late blight as a target disease. The information
>> available usually indicates that they are not as efficacious as
>> "conventional" materials, but if good coverage of crop foliage is
>> maintained they offer some hope for protecting an uninfected crop. The
>> OMRI approved materials include basic copper sulfate (NuCop 50w and
>> Champ WG are OMRI and the biological fungicide Sonata. Use a 5-10 day
>> schedule.
>> here are links to many images of late blight on tomato
>> http://www.hort.cornell.edu/department/Facilities/lihrec/vegpath/photos/late
>> blight_tomato.htm
>> and potato
>> http://www.hort.cornell.edu/department/Facilities/lihrec/vegpath/photos/late
>> blight_potato.htm
>> if you have any doubts send plant sample to: Ann Hazelirgg, UVM Plant
>> Diagnostic Clinic, Carrigan Ave., Burlington VT 05405-0082