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Old 07-11-2011, 01:32 PM
 
Location: New York, NY, USA
452 posts, read 748,257 times
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My dahlias are showing a disease that I have never seen before: The stem turns black, wilts, and between nodes is black and mushy. I use Miracle-Gro potting soil, an organic fungicide and water. Has anyone experienced anything like this before?
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Old 07-11-2011, 02:07 PM
 
Location: rain city
2,956 posts, read 11,046,069 times
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I've grown plenty of dahlias in my time and have found them to be very hale and hardy. But all plants are subject to one kind of disease or bug or another.

Have a look at these pages:
Dahlia Diseases
Dahlia Disease Problems
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Old 07-11-2011, 02:18 PM
 
Location: Out there somewhere...
38,687 posts, read 45,060,825 times
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Quote:
Originally Posted by Miranda Sebastian View Post
My dahlias are showing a disease that I have never seen before: The stem turns black, wilts, and between nodes is black and mushy. I use Miracle-Gro potting soil, an organic fungicide and water. Has anyone experienced anything like this before?
Those are all signs of overwatering, saturated soil that's ripe for fungi diseases.
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Old 07-11-2011, 07:14 PM
 
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I'm sure it's no consolation but mine seem to suffering a virus and I think I'll have to yank them. Hot and humid weather doesn't make it easy.
In all likelihood it is a fungus as Nitram said.

From your description the problem sounds like one of the following: Verticulum wilt or something similar called Sclerotinia Disease. I don't think the conditions have been really cool for you but there is the distant third possibility of Botrytis which is more common in cool, rainy conditions. Without a picture they are all still guesses.
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Old 05-26-2012, 06:31 AM
 
943 posts, read 1,500,116 times
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Quote:
Originally Posted by Miranda Sebastian View Post
My dahlias are showing a disease that I have never seen before: The stem turns black, wilts, and between nodes is black and mushy. I use Miracle-Gro potting soil, an organic fungicide and water. Has anyone experienced anything like this before?
is the miracle gro 5-20-20 that's what they like.. anything more is too much
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