Ah... I always get "blight" -- or something -- on my tomatoes. The only "cure" I have found is to fertilize them such that they "outgrow" it... the bottom part of the plant is pretty much dead, but the top is still growing. Well, that and growing plants inside a "hoop house" -- which I did this year, with the types that are always the earliest to succumb to disease, and they not only started producing earlier but are still ripening fruit.