This species generally does not overwinter in Illinois, except possibly for pupae or mature larvae in southern areas. The bulk of the spring population migrates into Illinois from southern states beginning as early as March. These moths are generally blown into Illinois on the southwesterly winds and storm fronts that are common in early spring. The females deposit eggs in areas such as low spots in fields, overflow ground, and in other sites traditionally overgrown with grasses or winter annual weeds. Weeds that are attractive to egg-laying moths include chickweed, shepherd's purse, peppergrass, and mustards such as yellow rocket.
Winter wheat is also a likely host.
The larvae hatch in S to 10 days, molt 6 times, and require 28 to 35 days, depending on the temperature, to become mature larvae. The larvae then enter the pupal stage, which lasts 12 to 15 days. The entire development from egg to adult moth requires more than 45 days. This cycle continues until the first frost, and three or four generations are produced each year, although only the first generation causes damage to corn. Back to Top Click on image for larger version Figure 2.