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Adult Forewings of the cabbage looper adult are grayish to dark brown with a silvery spot near the center; hindwings are pale brown. The wingspan is 33-38 mm. Immature stages Eggs are a flattened round shape (0.6 mm wide by 0.4 mm high) with fine ridges from top to bottom. Larvae are light to dark green with a light longitudinal stripe on either side of the body and two pair of abdominal prolegs. The body is thick, tapers toward the head and the larvae crawl in a looping fashion, arching the middle portion of the body. Larvae may reach a length of 35 mm, which makes it one of the larger larvae found on vegetable crops. This one was bright green and about 10 millimeters long.
This guy was chewing on my lettuce.