I suspect my pepper plants, but also tomatoes and eggplants have some form of disease/pathogen. They start healthy and then at various growth stages, the leaves turn brown at the tips and then the leaves drop. The plants never recover.
Pretty sure it's not under/over watering or over/under fertilizing as they turn from very healthy to sickly pretty quickly and at various growth stages.
Has anyone seen anything like this before? What can I do? HELP!