When I said I lost a couple of plants last year to blight or whatever, they died because I pulled them. I've never lost a single tomato plant to anything other than heat vaporization in a greenhouse. Been growing tomatoes 6-7 years and haven't sanitized anything other than trimmers. I could go to the trouble of spraying down 40 cages or whatever but to me that's work that won't pay off. I simply haven't had enough problems with tomatoes to bother. I amend the soil 10 times a year and don't bother worrying about disease.