Beginner Gardening: what's wrong with the tomatoes?, 1 by donnerville

donnerville wrote:
I have a patio tomato plant. It is in a very large pot all by itself and placed in full sun. I have a very small heavenly bamboo and a purple Oxalis nearby.

The newest green tomatoes don't seem to have this problem, but they all get damaged at some point later. There is hardly any undamaged part left by the time they ripe.

Can anybody please tell me what is wrong with them? Is this a disease? Can I still spray the plant and cure the problem or should I get rid of the plant? This is the first time I have ever tried to grow a tomato plant, and can really use some advice.

Thank you.