This is anthracnose, a fungal disease that affects the tomato fruit.  The fungus actually attacks green tomatoes but the anthracnose only becomes apparent after the fruit ripens.  A fungicide now will not control anthracnose this season.  Instead, plan to rotate where you plant tomatoes next year as the fungal population builds up in the soil when tomatoes are grown in the same place year after year. Remove all the spent foliage this fall.  Next year, you can begin a regular fungicide program which covers the developing fruit.

Thank you

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