Large moth captures don’t necessarily mean damage is imminent, but should alert growers to begin scouting three to four weeks after the capture. The map below displays the counties in red that have experienced a significant moth capture. Universities have established insect monitoring networks in their respective states to monitor moth flights and predict when damage may occur. The moths themselves don’t cause economic damage, but the eggs they deposit eventually hatch into larvae which can cause significant damage by feeding on young corn plants. They don’t overwinter in the Corn Belt, but the moths are carried north each spring by southerly winds. Black cutworm and true armyworm are sporadic pests in the Midwest.
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