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Dahlias stems suddenly black and rotten

Posted by jilluis 6a (My Page) on
Tue, Jul 13, 10 at 22:52

I planted about ten dahlias this year. They were all doing great. Pretty much overnight, the stems blackened and seem rotted on the one of the end (one of our favorites!). The leaves then withered. What caused it? What can I do? There is a tiny shoot that is looking a bit sad but is still alive (at the top of the plant in the picture if I can get it to load). Is there anything I can do to save this? Should I dig it up and replant it? Just look at it sadly every day?

A little background info: It’s been crazy dry here for the past month, and I’ve watered sporadically, but not madly so. Two out of the last three days it has dumped a huge amount of water though. No insecticides or wacky fertilizing. The soil is good quality. The cosmos to the left are doing great, except that the flowers frequently have a couple yellowish brown ?beetles? on them, that I kill and they get replaced. I’ve seen a few earwigs and a few indescribable soil bugs. The dahlias to the right of this are doing great. The soil right at the dying plant is maybe an inch lower then the rest of the plot so maybe the water accumulated? This is my second year planting dahlias (same spot) and no problems last year.

The dahlias are a special gift from our neighbor when we first moved in so I don’t know what type it is, except it is orange and yellow and beautiful!!! Thank you very much for your help. Hope I didn’t ramble on.


Follow-Up Postings:

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RE: Dahlias stems suddenly black and rotten

Drawing on my limited experience, I would say it might be rot. If your soil is not draining right; you got to be careful with the watering and the big rains you recently recieved may have been the kiss of death. I've lost two to rot this year; but we had really really wet weather in June. the ones that I lost were in spots where the soil doesn't drain as nice and it also sits lower (like your spot).


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RE: Dahlias stems suddenly black and rotten

Possibly cutworms??? Steve S.


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RE: Dahlias stems suddenly black and rotten

Bleck...
I dug them up. Totally rotted and gross!!
Two others were looking wilty so I dug them up, one was fine but the other was rotted too. I cut out the rotted stuff, let it dry for a few hours... Now it looks eve worse! but we will see! Thanks for your help


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