Sick plants

[Seth225]

Ive done pretty well this year with my tomatos with Marshas help. I have had more tomatos than I know what to do with at times, and I am very pleased with the overall results.

There have however been a couple instances of sick plants despite my best efforts. I have attacked a couple photos and I was wondering if anyone could identify for sure what ails these poor guys.

As you can see on one plant the leaves turn a sickly yellow, then brown and die. That variety is cherokee purple I believe

The other plant is/was girl girls weird thing and the leaves just dry out, shrivel, turn black and die.

I hope photos uploaded successfully.