I have an old book-Ernst Gaumann "Principles of Plant Infection" Crosby
Lockwood and Son London 1950.
It gives a good account of clubroot infection. Infection drops off rapidly
as the soil pH is increased in the case of a particular brassica falling
from 100 to 20% as pH is increased from 5.7 to 6.2, to virtually 0 at pH 7.
He also reported that clubroot was sustained in the soil by wild
brasiccas-charlock, lady smock,shepherds purse, garlick mustard etc.and can
be eridicated in 2 seasons if these weeds are removed.
I had a lot of trouble with club root when I lived in Cheshire and managed
to control it using this information.
Some brasiccas-Pak Choi, Cauliflower seemed to be sensitive, sprouting
brocolli spring cabbage wallflower were more resistant.
Apart from keeping the soil pH up and getting rid of shepherd's purse, I
used to surround the root balls of the plants with powdered chalk (my
neighbour was a salesman!) when planting out.
This with a pKa of about 8 would ensure an alkaline but non corrosive start
to growth.
Regards
David T
"Bob Hobden" wrote in message
...

"Rod Craddock" asked after
"Bob Hobden" wrote...
For those of you that grow veg but don't take the Kitchen Garden...

They report that a Club Root resistant F1 Cabbage has been developed in
Holland and the seeds will be available through Suttons and Dobies.
Perfect timing as far as I'm concerned. :-)

Is club root present on your new site Bob?


I'm told that it's present on the site but on the other side, as our new
allotment hasn't been worked for at least 10 years I don't know about our
specific plot. I've noticed that the one next to ours, taken by new
gardeners from Christmas last year, has a good bed of Sprouts that look
very healthy so I can but hope we are free of it too.
--
Regards
Bob
In Runnymede, 17 miles West of London