I found out about it a couple of years ago, and so far it has worked for me when part of a rhizome is affected. The main ingredient of SoftSoap (and others as well, although I don't know which others) is Triclosan, and it does something to kill or inhibit the bacteria -- although again I really am not sure what it does. I think encapsulates bacteria so they can't reproduce, or something like that -- or maybe it just flat out kills them. But it's a quick fix without any mixing. Some people mix 3 Tbsp. SoftSoap to 1 gal water and water the plants, or you can just go out there with your little bottle and zap it! Love it! But I always try the sunlight technique first if I can.
