I think there are different species of blister beetles, but here's an interesting factoid -- (a species of?) blister beetles is attracted to blooming alfalfa:
MANAGEMENT There are no known predators or parasites that effectively control blister beetles. Blister beetles are attracted to blooming alfalfa. Therefore, to reduce the incidence of blister beetles in alfalfa, cut hay before bloom. If beetles are found, remove the conditioner wheels from the swather in order to prevent crushing beetles. Also, these beetles are found on the edge of the field or congregated in groups within the field. Skip such areas when cutting or pick up the bales for these areas separately and isolate them from the rest of the field. No treatment thresholds have been established for blister beetles.
The one in the article photo doesn't match yours. The kind I get is called margined blister beetles, and they seemed to like beets and chard the best. At least they started with those, then moved onto my peppers.
I'm thinking if the species overwinters in the soil, then fall application of beneficial predatory nematodes may help. Perhaps neem will work. They are pretty easy to drown in soapy water, though. Oh, and their juvies were bright orange or red in my garden. I should start keeping watch for them since they came when it got really hot last summer, and we are getting into the July summer heat now. A big storm system is approaching from southwest today, and those seem to bring the hot weather pests along with the weather as well.
For immediate repellent, last year, I resorted to dropping them on the ground and stomping on them -- a variant of making bug smoothies in the blender and spraying the plants -- especially necessary in this case since the chemical they exude "cantharidin" can contaminate the crop. I can't say for sure that it helped though.
--ETA-- haha rainbowgardener got her post in with quote from same source while I was composing mine!