Sick foliage & issues

[taboule]

Hi,

I've grown peppers before but never paid close attention, mainly focused on tomatoes and other. This year I got very interested and also started growing in containers. The concept of overwintering them is most interesting and will try that.

Most are growing well and healthy. Here's a few issues I could use help with. The first 2 show yellowing and brown spot, similar to septoria on a tomato. The other two show blackening.

Is this a fungus or what. Thanks for any tips.