Turns out the cabbage moth is apparently territorial.
These darn pest, if unchecked, the caterpillars can seriously impact the quality of the developing plant. Usually, by the time you start to see the moths flitting about your brassicas, the eggs have been laid and damage is already being done.
So, I've reverted to providing "look-alike" or decoys among my broccoli and kale plants, see above. The decoys work when made to look like the female moth, identified by the 2 spots on the upper wings.
I also keep an old tennis racket handy and swat them every chance I get.
It's a battle every gardening season, from the small, seemingly harmless moth, to the large and destructive four-legged Odocoileus virginianus or white-tailed deer.
Game on!