Dahlias forum→Nematodes on dahlia roots

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Name: Destiny
Dayton, OH (Zone 6a)
Nov 6, 2020 7:30 AM CST
A few days ago, I dug my dahlias to overwinter and discovered one with small bumps over the tubers, roots and lower stems. I strongly suspect nematodes, which is very unwelcome considering this came out of a large perennial bed.

The immediate area around the dahlia tuber is for bulbs/tubers/annuals and is now bare but it borders an area with tree and herbaceous peonies. I have not yet tried to dig up any of the peony roots- but I'm concerned that they could be affected if there is an infestation.

Does anyone have advice for dealing with nematodes in a perennial garden?
Name: Suzanne/Sue
Sebastopol, CA (Zone 9a)
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Nov 6, 2020 9:01 PM CST

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Do you have a photo of the roots? It could be a gall.
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Name: Destiny
Dayton, OH (Zone 6a)
Nov 7, 2020 4:30 PM CST
There were little light colored nodules on the tuber and the lower stems when I dug it up- but when I let the tuber dry they almost disappeared. They must have been filled with fluid and now that the outside of the tuber is dry they just look like roundish rough spots on the surface.
Here is a picture, I highlighted one of the round spots but there are plenty more.
Thumb of 2020-11-07/Destiny7/128138

Name: Melissa
Omaha, NE (Zone 5b)
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Nov 7, 2020 5:55 PM CST
I think they were lenticels. The tubers will be fine. They seem to sporadically develop on the tubers when the soil is very wet. I usually see it on my potted dahlias, as I have a tendency to over water them in the Summer.
Name: Destiny
Dayton, OH (Zone 6a)
Nov 8, 2020 9:52 AM CST
Thank you Melissa! I looked at lenticils- and indeed that was exactly what the bumps looked like. We have had a very wet fall but I didn't make the connection.

What a relief! Thanks again Thumbs up

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