I have four tomato plants, the picture is of a patio tomato, I also have a sweet 100, sun gold, and lemon boy. I bought all of them, they were a few inches tall, some up to a foot maybe. I transplanted them into five galloon containers after a few weeks, then into seven galloon containers because the cages couldn't get buried deep enough in the five. These are on my patio of a third floor apartment building on a busy street. They were fine for the first few weeks but a few days ago I noticed the bottom leaves started turning yellow then brown...there are some small spots on some, but they don't have the dark black ring like blight...any ideas? I don't want to lose my plants.

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