In my search for diseases on the web, I came across the following suggestion. If you have blights this year, then next year Start about 2 weeks after transplant, with a good fungicide, apply per instructions for the whole season. IE Daconil is every 7 to 10 days. Wilts. RE: http://www.canr.uconn.edu/ces/ipm/ Click on vegetables Scroll down to tomatoes Find and click on Vascular wilts of tomato. Last par on that page. under prevention Fusarium likes a soil pH at 6.5 and lower Verticillium likes a pH of 7.5 and higher. Conculsion: Keep soil pH between 6.5 and 7.0 and you can avoid these. Low cost, non-toxic. Less than 1 hour per year for the average home gardener.