Sorry it's late. All brassicas get hit. I've resorted to root types (radish and turnip) and kohlrabi since the worms rarely fatally damage those plants. They destroy cabbage plants.

I'm in NW Ohio, newly zone 6a. My garden is at my in-laws' farm because there's decent soil there already, instead of building soil at the house we are renting.

I've kicked around wood vinegar. I've not had great luck with row cover, it's too much of a hassle to work around in the limited time I have to work, so I tend to neglect plants under it.