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Counties with armyworm moth traps (click on a highlighted county to see trap captures)

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NameIllinois True Armyworm Monitoring 2012
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Most armyworm moths migrate into the Illinois from the southern states in April and May. Since moths prefer dense vegetation for oviposition sites, armyworm infestations generally develop in areas such as grass pastures, roadsides, along fence rows, and in weeds in reduced tillage fields.

Armyworms consume leaf tissue of corn plants. Feeding is usually confined to leaf margins, but in some instances, larvae may strip the plants entirely of leaf tissue. Corn generally recovers from damage caused by moderate infestations if the growing point has not been injured. In small grains, armyworm larvae may strip the leaf margins and move up the plant to feed on the panicles or flowers. Larvae will feed on the flag leaves, kernels, and clip the stems just below the heads.

Armyworm Fact Sheet