Hate to see you give up so early in the game, Mary. I'd go buy some transplants at Lowe's or HD and bung them directly into your Earth Box. Don't give up, they really do grow pretty easily. Even your plants may survive, give 'em half a chance.
We had literally buckets of delicious little 'grape' tomatoes from the school garden last year, well into January and February when we had to remove the plants and start new ones because the plants got too big. The only pest we had were the tomato hornworms, which the kids took great delight in picking off by hand (they do wear gloves). No disease problems at all.
What variety were the ones you started from seed? Heirloom varieties are much more susceptible to disease. I always choose hybrids with as many numbers and letters after the name as possible.
Just discovered that I have one 'heat tolerant' tomato that has survived the summer in one Earth Box, although no fruit. I started it late, it did set some fruit but most of it dropped. But it has healthy foliage. I may yet see some tomatoes from it!
