There are all types of things that can be used to control flea beetles, but usually with my peppers they don't actually do that much harm (my eggplants suffer even more from them) but the only thing I actually do most of the time is just put down a heavy mulch over the winter to make it difficult for the larva to come out of the soil and get to the plant in the spring. There are things like nematodes, trap plants, diatomaceous earth , organic sprays and stronger chemical to kill the beetles, but they are very hard to control most of the time no matter what you use. So now I just try to limit their damage and let the plants suffer with holes in their leaves. The big problem with that is that not only do they make the plants look bad, but the beetles also bring along diseases and blights that can even kill the plants.
Not sure that actually is flea beetle damage, so check close and see if you find any little flea like beetles they are pretty had to see, and they will jump away if you get close to them so you have to look very close. I have had problems with grasshoppers and snails of some of my Zinnias also.
