Two years ago, my petunias succumbed to VW. I changed the soil and scrubbed the pots so last year they were fine. I have done research and cannot find an answer on the net so I thought someone here may know. Since changing the soil every year is not practical, (I have many large pots), I am wondering if there are any fungicides that can be applied to the soil to kill the spores? I cannot find any info on this.
Also, would the spores over-winter and survive the horrible winter we have had? And, if so, how long do the spores live without a host plant? Would rotating pots on a two-year basis be enough?
Thanks for any help.