Just curious.......I've always bought my tomato plants from one nursery through the years. I've pretty much always had a leaf spot develop, but it's gotten much worse. I know it's mostly a soil problem (I grow most everything in large raised stock tanks), but I do rotate the veggies, mulch under the plants with grass, and I learned recently to prune the bottoms of the tomato plants, to allow for better ventilation. I'm also going to decrease the number of plants in each stock tank. But.....is it possible that I'm getting the leaf spot problem from the nursery I always buy from? Would it make any sense at all to change where I buy my tomato plants?