Club root on kohlrabi

So so disappointed ... I had a look at my kohlrabi this morning and something prompted me to pull two up. Sad to say that they seem heavily afflicted with clubroot. I didn't lime before planting and I have no idea what the gardener before me planted in the area that is now occupied by my cauliflower, cabbage and kohlrabi.

Apparently he planted brassicas. It seems I may have also shot myself in the foot by accepting seedlings from a fellow gardener - she may not have started hers off in sterile potting compost and the fungus could have been present even before they reached my garden.

You can see more pictures of the afflicted roots here.

Tomorrow I have the wonderful task of either going back and pulling out all of my brassicas to try and contain the spread or just leaving them alone and hoping for the best for the rest of this season.

Oh, and the three trays of broccoli and cauliflower seedlings I have here waiting to go in the ground? I guess they'll be ... not.

In the autumn I can heavily lime the brassica area, which will be a different patch in my rotation and then try again next year.

Here's another useful factsheet. And in case you wanted to know, clubroot is called 'knolvoet' in Dutch.