This prevents the plants from developing marketable heads. They sometimes kill the entire plant. Management Because this is typically an Atlantic coast and southern pest, this insect is not a problem with spring crops. Producers need to begin monitoring when fall plants are first set into the field. Fall cole crop producers in the Atlantic coast states spray preventively for this pests after plants are set into the field.
Controls used for other cabbage pests are effective against cabbage webworm when timed properly.
Sprays should be applied while the larvae are small before they construct their protective silken webs. Once inside the the folded leaves the larva are protected from insecticide sprays. Sprays need to be directed underneath the leaves and down into the bud. The use of some products may not be legal in your state or country. Please check with your local county agent or regulatory official before using any pesticide mentioned in this publication.