Thanks Monika. That would make sense. We did have a dry spell this year and I could have been a bit more proactive with the watering. That would also explain why I didn't see it with the Earlies.
Thanks again.

I have recently dug my Desiree potatoes and found a couple of the large ones with interiors hollowed out from one end and full of slime. They are not the seed potatoes as they are identifiable. I've tried to ally this with soft rot, black leg or blight, but the symptoms don't match. A fellow allotme...

To answer Westi on 16th, yes they are wood surrounds but new and well treated. I suppose the compost itself could have housed them. Quite a lot to think about. Fact remains that the celeriac in the soil are ok but those in the raised bed failed. Drying out is a strong possibility.

Thanks just for your thoughts. We are growing some roots in open ground and they seem to be ok. The raised bed could well have dried out this year and the roots have been shaded somewhat by a rather prolific globe artichoke. We are also growing a few spare parsnips in the same bed but they seem OK. ...

I have a query re celeriac. We grew some plug plants last year and got some small roots but pretty good. This year we started seeds in the greenhouse which seemed to not take so we bought more plugs, only to find our own sowings had started. So, two versions to compare. We had half a dozen left over...