Answer: It sounds like you have a classic case of early blight, a soil-borne fungus. The best cure is to mulch the planting with hay or straw to prevent the water from splashing disease spors on the leaves. Also rotate your planting not growing your tomatoes plants in the same location for three years. One other solution you could use would be to grow your plants in large containers such as 5 gallon buckets, adding new soil every year. You are encouraging the fungus by using the same soil year after year.
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