Cabbage white butterfly is a fierce predator of all cabbage. Catch it early and you won't have problems. If not, follow these control tips!
Natural Ways to Control Cabbage Worms - Dengarden
Tips For The Control Of Cabbage Moths And Cabbageworms
The Cabbageworm Caterpillar In Your Garden: How To Control It
Staatsbosbeheer
Controlling Cabbage White Butterflies in Tasmanian vegetable
Attracting Cabbage Butterflies to Your Garden
3 Ways to Get Rid of Caterpillars - wikiHow
Green caterpillars on broccoli, cabbage, cauliflower, and kale
Cabbage Caterpillars Purdue University Vegetable Crops Hotline
How to Control Cabbage Worms on Brassicas and Cole Crops
How to Identify and Get Rid of Cabbage Worms Effectively
How to deal with cabbage white butterfly