The narrow off-color leaf edges may be environmental.

Difficult to say what the dark splotchy on the stems are.

Has it progressed to additional leaves? If not, just remove the affected ones.

Some of my tomatoes have the narrow dark leaf-edge problem. I've never seen it before.

I don't see it on the newest leaves, but the middle and some lower leaves. It doesn't seem to spread, and I'm postulating that it's not related to any of the normal yellowing and spotting on the lower leaves. So I'm not worrying about it.

Apparently similar edge damage can occur in other crops with low levels of calcium ... but I doubt that's what's going on here because I haven't seen any blossom end rot.

Low calcium=, when expressed in the leaves, typically aborts tip growth.

jean, in the case of my tomatoes, it's not leaf tips but edges. What do you think: does that sound like a lack of calcium?

Well, mine is definitely bacterial canker. Two plants for certain.

Never seen it here before (or in Illinois when I grew tomatoes in the Olden Days), so I'll blame Bonnie Plants....

Not happy here.

If anyone else encounters this, here's a good article with some photos:
http://vegetablemdonline.ppath.cornell.edu/factsheets/Tomato_Bacterial.htm