I thought that TSWV was spread by thrips and not a soil born disease? Many weeds are host plants for the thrips. My problem is that I don't want to grow the resistant varieties, I like growing lots of different heirlooms. And my understanding about resistant varieties is that it doesn't mean that they can't get the virus, it just means they are less likely. In my garden last year they didn't seem to care which plant they attacked. I also thought that warm, dry conditions in the spring can lead to earlier and more severe problems with TSW than cool, wet springs. Crop rotation is a good idea as a general practice to detour many diseases.
