Although these caterpillars emerge by late spring in the South, they may not appear before July in northern and midwestern states. Over a 3-week period, the larvae feed during the day on tender foliage. Mature sixth instars burrow into the soil and change into pupae. Two weeks later, the second generation of moths emerge. In southern states, including North Carolina, three to four generations occur each year.
Early detection is important in maintaining populations below economic injury levels.
For specific control measures, consult current North Carolina Agricultural Chemicals Manual .