Certified GKH Gardening Expert
I see two, separate, issues. I see a fungal/bacterial infection, and spider mite damage. Often, they are related problems.
Usually, treating peas for infection will prove futile. By the time the infection subsides, production will have been drastically affected to the point that you may not get very many pods, if any. Starting over AFTER correcting the issue at hand will be the best course of action.
Treating with a fungicide/bactericide will be the way forward, as well as having a method to control spider mites. The infection has likely made its way into the soil by now, so treating both issues will be necessary before replanting.
Here are some articles that will help: