Arugula is in the Brassicaceae family. Cabbage Whites eat every thing in that family.

It is listed in the HOSTS database, under the old synonym Cruciferae family name.

I recall one forum member a while back deliberately raising cabbage whites, but since it is a commercial and home garden pest and is very common, few hobbyists bother with it.

I don't raise Cabbage Whites deliberately because they are considered an invasive species. However, I don't discourage them from visiting my garden. Radishes and Mustard seem to be favorite hosts around here.

Crazy that they are considered an invasive species. Thanks, everyone, for your comments and help.

They are not native. They are a species from Europe. If you ever grow cabbage, broccoli, etc., they lay and eat these up. Most people use garden covers to keep them off so they don't have to spray pesticides. They are very prolific, too.

Cabbage butterflies are great for when you have a pet praying mantis. Late in the summer, I can count on 12 to 20 cabbages per hour flying through my next-door neighbor's garden. Easy pickins.

I've tried growing broccoli a few times but it is a lost cause.