Early tomato blight is common on both tomato and potato plants, the early version of this blight (yes, there is more than one type) is caused by fungus. It typically makes its appearance on the lower leaves and starts out as smaller brown spotting, if you look closely there are rings that form giving it the appearance of a bulls eye.
Eventually it speads out (or up) to the rest of the plant and other surrounding plants as well. As the blight matures it turns yellow - killing the leafs and fruit, and leads to them falling off.
The best preventative measure for tomato blight is to use special care around the plants. More information can be found here on tomato blight.
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