When abundant, these caterpillars eat all the food at hand and then crawl in great armies to adjoining fields. After feeding for 2 or 3 weeks, the larvae dig about 20 mm into the ground to pupate. Within 2 weeks, a new swarm of moths emerges, usually flying several miles before laying eggs. Several generations may occur each year. Cold, wet springs seem to reduce the effectiveness of these parasites and a population explosion often results.
Early planting is the most effective cultural control method in our state.
For recommended chemical controls, consult the current North Carolina Agricultural Chemicals Manual .