Flea beetles can be a real problem for me some years.
Notice what is said about the larva: "Grubs feed on or in roots, tubers, and lower stems for 3 to 4 weeks before pupating." I doubt if most of us are even aware that our plants are suffering from a flea beetle attack - below the surface of the soil!
Weakening the host plants by feeding on their roots and then emerging to attack the foliage. This may not be what you are talking about with potatoes, Jal, but some years what must be a multitude, damage my tomatoes.
Usually, I see damage in the brassicas and really must
take some kind of action to limit it. For some reason, flea beetles usually get a good jump on me and the tomatoes before I realize what a problem they are causing! I even notice that this year, some of the fruit was chewed on!
Brassicas might be useless, tomatoes, and I might mention eggplant, get beaten up. Rotenone/Pyrethrin spray, oversprayed to hit the ground where a good many of the beetle hide, seems to work fairly well. That is, when I think to get it on. Unfortunately, nothing comes to mind to do about the larva below ground.
Probably row covers over everything
would be best but I can't see it being the way to go in a large garden and, what with all the wind that blew thru this spring . . . . . . . . . . .