From the sound of it, I'd guess either cucumber mosaic virus (a viral disease) or bacterial leaf spot (caused by a bacterium). Peppers are usually fairly easy to grow, but they are susceptible to ...

Bacterial leaf spot will appear rapidly, as more diffuse ... and many that are found on tomato can affect members of other solanaceous plants such as potato, pepper, and eggplant, or weeds such as ...

Leaf spots can vary in size, shape, and color, depending on the specific cause—whether a fungal or bacterial pathogen—and can ...