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Scout for Black Cutworm in Corn Early this Year

May 8, 2023
Black cutworm cutting dates.

Black cutworm (BCW) is a migratory pest that arrives in Iowa with spring storms each year. Black cutworm moths lay eggs in and near crop fields, and larvae can feed on leaves or cut corn seedlings. Larvae must attain a certain size (4th instar) to be large enough to cut corn plants, and cutting can occur until plants reach the V5 stage. Black cutworm is sporadic and unpredictable, making it essential to scout to determine whether BCW larvae are present in a field and if management is required.

Crop: 

Begin Scouting for Black Cutworm in Corn

May 13, 2022
Estimated black cutworm dates for each Iowa crop district.

Black cutworm (BCW) is a migratory pest that arrives in Iowa with spring storms each year. It is sporadic and unpredictable, making it essential to scout to determine whether BCW larvae are present in a field and management is required. Because BCW is sporadic, it is usually not economical to use preventative insecticide applications; however, rescue treatments can be very effective if scouting reveals larvae are present.

Crop: