If he is dealing with wilt then cucumber beetles need to be controlled or it's likely to happen every year.

County Fair is a variety that is good for pickling as well as fresh eating that is very resistant to wilt. It's the only one I know of. It isn't immune, but I have lost cuke after cuke of other varieties while County Fair kept on producing despite badly chewed up leaves. I have lost a couple of them over the years, but it's not common.