Re: Help (Kuhn's disease)
In a message dated 8/20/99 10:40:49 PM Eastern Daylight Time,
Greg@schraiber.com writes:
<< Subj: Help
Date: 8/20/99 10:40:49 PM Eastern Daylight Time
From: Greg@schraiber.com (Greg Schraiber)
Sender: owner-pumpkins@mallorn.com
Reply-to: pumpkins@mallorn.com
To: pumpkins@mallorn.com (Pumpkins)
List,
I continue to have problems with my AG (Burke
1092). I have no fruit set. While the 1092 had
flat vined it did produce numerous secondary
vines. In a earlier post I mentioned that I
thought the plant had bacterial wilt. Since then I
have learned of two simple tests for bacterial
wilt and my plant failed both. My local extension
office suspects Fusarium Wilt. They ventured
fumigation and soil solarization as possible
controls. I considered throwing a virgin into the
volcano but opted instead to seek a scientific
solution. I need Help! Here is a run down of
observations and symptoms. I do not know if all
are related.
a. Healthy looking leaves wilt on a hot day, but
recover when cooled.
b. 7-14 days may pass before a browning around the
outer edges of the leaves is noticed.
c. The leaf yellows. The leaf veins remain green.
d. The leaf stalk turns a translucent brownish
yellow, but remains firm.
e. Over the next few days the browning continues
inward until the entire leaf is brown and wilted,
draped around the stalk.
f. At this stage, if the stalk is cut close to the
vine, water will pour out.
g. The stem then turns to mush.
h. As the affected leaves progress down the vine,
the vine itself begins to deteriorate.
This started at the base of the plant and has been
moving down select vines. Two thirds of the plant
has now been removed. The stump seemed ok when I
buried it about 30 days ago after removing a
number of secondaries and leaves from the area.
The garden is in full sun except early in the AM
and later in the day before dusk. No borers
present. Squash bugs early in the season, but
seemed to be killed by insecticides. Cucumber
beetles continue to survive in small numbers
despite repeated applications.
Plot is ~500 sq. ft. and is surrounded by turf
grass (mixed variety).
Any help for diagnosis as well as methods of
eradication would be appreciated.
Thanks for everything,
Greg Schraiber
Machesney Park, IL
(Wherever the heck that is)
>>
I believe it is the following.
Approximately 4 years ago a strange new disease first appeared in the Pumpkin
Patch of Jim Kuhn in NH. A perfectly healthy Pumpkin plant and Pumpkin if it
has one would collapse into a brown soup within week or two. I don't believe
it was ever identified as any existing disease a bacterial/viral systemic
disease is suspected. I also had one plant and a large Pumpkin do the same
but other plants were not affected. Jim is still able to grow Pumpkins and
grew the 929 NE champion in 1997. He is spraying with copper this year to
control something but I didn.t get a chance to talk to him about it at the
picnic. Someone else on the list from New England may know more. I
nicknamed it Kuhn's Disease because it first appeared in his patch.
George Brooks
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