A brown moth whose caterpillars are pests of cabbages and related plants.
Mamestra brassicae, family Noctuidae.
The other significant pest of these plants is the cabbage moth....
Plant cabbage, broccoli, bok choi and all types of mustard until mid-September, covering with lightweight row covers to exclude cabbage fly and cabbage moth.
They are known to eat cabbage moths, bollworms, tomato hornworms and broccoli worms.