I read your site and I believe my tomato plants may have Bacterial canker. My leaves turn yellow then brown and die. From the bottom up. I also noticed that the main stem of the plant has a lot of bumps on it at the bottom and makes its way up as well. I lost my whole garden in about a week last year to the same issues so it kills them fast! What can I do or purchase to try to save them? Is it too late? Please help!
Thank you so much for your time,
This is a frustrating disease to deal with. These links will help you verify the disease and the best coarse of action.