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Main tomato stalk turning dark color(?)

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Main tomato stalk turning dark color(?)

Post  Mr. Green Jeans on 7/8/2013, 6:35 pm

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!
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Re: Main tomato stalk turning dark color(?)

Post  Mr. Green Jeans on 7/8/2013, 7:13 pm



She sent me some pictures.
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Re: Main tomato stalk turning dark color(?)

Post  camprn on 7/8/2013, 8:20 pm

Oh no, that looks pretty normal to me. Your friend is going to need a bigger and taller stake. Wink

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Re: Main tomato stalk turning dark color(?)

Post  mschaef on 7/8/2013, 9:16 pm

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.
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Re: Main tomato stalk turning dark color(?)

Post  llama momma on 7/9/2013, 6:58 am

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.
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Re: Main tomato stalk turning dark color(?)

Post  Mr. Green Jeans on 7/9/2013, 10:05 am

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.
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Re: Main tomato stalk turning dark color(?)

Post  camprn on 7/9/2013, 10:50 am

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.

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Re: Main tomato stalk turning dark color(?)

Post  Mr. Green Jeans on 7/11/2013, 11:30 am

Here's a shot of a stalk of a plant that was removed to be sent for testing @ the extension.

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Re: Main tomato stalk turning dark color(?)

Post  Mr. Green Jeans on 7/11/2013, 11:31 am



 Sorry the picture is sideways
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Re: Main tomato stalk turning dark color(?)

Post  llama momma on 7/11/2013, 12:45 pm

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.
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