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I had club root bad in a garden I used to work in. We got round it by using Armillatox which was brought out by M<rs Victoria Bray for honey fungus. It was very successful but now the new regulations etc. it cannot be sold as a soil fumigant only as a path cleaner. It exactly the same and can be bought in any garden centre. If you look online it will tell you the dilution rates and how to use it. Many folk still use it with good results.