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Main tomato stalk turning dark color(?)
4 posters
Page 1 of 1
Main tomato stalk turning dark color(?)
A friends garden I saw today had the bottom six inches or so of main stalk of her tomato plants turning a dark color, almost black (or a VERY dark green). Sorry, no pictures. She's been away for several days, & can't really say when it started or if it's progressing. The rest of each plant look very normal & healthy. She planted early for southern Connecticut & her plants are about 4' high now. NOTHING on the leaves at all.
A stroll through the interwebs suggests this could be caused by Alternaria stem canker, bacterial canker and both early and late blight.
But I don't see lesions or anything like what is described ....
http://homeguides.sfgate.com/stems-turning-black-tomato-plants-25580.html
Is this likely to spread up the plant?
Thanks!
A stroll through the interwebs suggests this could be caused by Alternaria stem canker, bacterial canker and both early and late blight.
But I don't see lesions or anything like what is described ....
http://homeguides.sfgate.com/stems-turning-black-tomato-plants-25580.html
Is this likely to spread up the plant?
Thanks!
Mr. Green Jeans-
Posts : 37
Join date : 2012-09-26
Location : Fairfield County CT
Re: Main tomato stalk turning dark color(?)

She sent me some pictures.
Mr. Green Jeans-
Posts : 37
Join date : 2012-09-26
Location : Fairfield County CT
Re: Main tomato stalk turning dark color(?)
Oh no, that looks pretty normal to me. Your friend is going to need a bigger and taller stake. 

43 years a gardener and going strong with SFG.
https://squarefoot.forumotion.com/t3574-the-end-of-july-7-weeks-until-frost
There are certain pursuits which, if not wholly poetic and true, do at least suggest a nobler and finer relation to nature than we know. The keeping of bees, for instance. ~ Henry David Thoreau
https://squarefoot.forumotion.com/t1306-other-gardening-books
Re: Main tomato stalk turning dark color(?)
It looks to me like the steam is turning to wood. Like a tree trunk. This has happened to my pepper occasionally over the years and is nothing to worry about.
mschaef-
Posts : 598
Join date : 2012-03-12
Age : 37
Location : Hampton, Georgia
Re: Main tomato stalk turning dark color(?)
Greenjeans, I wonder if your friend has heirlooms since a couple of mine have dark stems too. Those are growing as well as the others.
llama momma
Certified SFG Instructor-
Posts : 4921
Join date : 2010-08-20
Location : Central Ohio zone 6a
Re: Main tomato stalk turning dark color(?)
Thanks all for the help so far. The pictures actually don't show how really dark the lower stems are (especially compared to the rest of it). I hope to take some better pictures myself today.
I believe the ARE heirlooms. A few of her plants have died.
I believe the ARE heirlooms. A few of her plants have died.
Mr. Green Jeans-
Posts : 37
Join date : 2012-09-26
Location : Fairfield County CT
Re: Main tomato stalk turning dark color(?)
Some photos of the foliage would be helpful as well. I can see in the above photo at least one brown spot and fome foliar yellowing.
43 years a gardener and going strong with SFG.
https://squarefoot.forumotion.com/t3574-the-end-of-july-7-weeks-until-frost
There are certain pursuits which, if not wholly poetic and true, do at least suggest a nobler and finer relation to nature than we know. The keeping of bees, for instance. ~ Henry David Thoreau
https://squarefoot.forumotion.com/t1306-other-gardening-books
Mr. Green Jeans-
Posts : 37
Join date : 2012-09-26
Location : Fairfield County CT
Mr. Green Jeans-
Posts : 37
Join date : 2012-09-26
Location : Fairfield County CT
Re: Main tomato stalk turning dark color(?)
Oh ok, I don't think my black stem goes up that far. It turns back to green and stays that way the rest of the way up. There is no leaf damage either like what I see in the last picture. Curious to what's going there, please let us know.
llama momma
Certified SFG Instructor-
Posts : 4921
Join date : 2010-08-20
Location : Central Ohio zone 6a
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