"Bertie Doe" wrote ...
I'm about to get a delivery of 100 plugs of cauliflower and cabbage, but
my normal supplier of CR Control, say it's now banned by the Gov.

He suggests using collars, which stops the maggots reaching down into the
roots - but is there an alternative on-line. I'd prefer to use a dip
treatment. I can't imagine farmers putting collars on fields of brassicas.

The collars only work on Cabbage Root Fly.
Club Root is a disease which remains in the soil and reinfects young plants.
A high pH helps which is why you lime a brassica bed, and growing them in
pots until quite large before planting out helps too.
An old gardener I knew used to disinfect, what was to be his brassica bed,
during winter with Armillatox (or was it Jeys). He never had Club Root on
his brassicas or White Rot on his onions.

--
Regards
Bob Hobden
17mls W. of London.UK