Alton N. Sparks, Jr., University of Georgia, Bugwood.org
Size: Up to 1/3 inch long
Where/When: The larva prefers cole crops, such as cabbage, cauliflower, broccoli, kale, rutabaga, radishes, turnips, collards, horseradish, and other crucifers. The larva is active from late May or June until the end of the growing season with numbers decreasing after Spring.
Significance: Damage may result in stunted growth; reduced yield; death of young seedlings; and malformation of cabbage, broccoli or cauliflower.