If you grow any cole crops—cabbage, broccoli, cauliflower or kale—you know that little green worms can wreak havoc on your plants. Early scouting and control are key to managing the pest. If you see the brown or white butterfly flying around your plants, they are looking for places to lay eggs and you will have worms eating your cruciferous vegetables soon. Here are links from K-State Research and Extension with detailed information about the cabbage looper and imported cabbageworm.
https://hnr.k-state.edu/extension/info-center/common-pest-problems/common-pest-problem-new/Cabbage%20Looper.pdf
https://hnr.k-state.edu/extension/info-center/common-pest-problems/common-pest-problem-new/Imported%20Cabbageworm.pdf
https://hnr.k-state.edu/extension/info-center/common-pest-problems/common-pest-problem-new/Cabbage%20Looper.pdf
https://hnr.k-state.edu/extension/info-center/common-pest-problems/common-pest-problem-new/Imported%20Cabbageworm.pdf