buckeye rot of tomato 

A processing tomato with Buckeye rot. Figure 1. A processing tomato with Buckeye rot.
Four processing tomatoes with diverse symptoms of Buckeye rot. Figure 2. Four processing tomatoes with diverse symptoms of Buckeye rot.
Four tomatoes with Buckeye rot with a range of symptoms. Concentric circles of necrosis is typical of Buckeye rot. Figure 3. Four tomatoes with Buckeye rot with a range of symptoms. Concentric circles of necrosis is typical of Buckeye rot.