Before I started using my current root stock which has fairly good resistance to Bacterial wilt, I used to pour a gallon or so of a 10% solution of bleach in the soil where the plant was removed. Of course I had to wait a week or two before replanting in the spot but I never had a problem with the follow up plant getting Bacterial wilt. It was a much easier solution than digging out the dirt and replacing it and it worked for me.
Bill
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