Source: Purdue University

The University of Kentucky has sent out an alert concerning the large numbers of fall armyworm moths being captured in their pheromone trapping program. Forage fields in that state have been severely damaged by larvae.

Female moths arriving from southern states will seek late-developing corn in which to lay their eggs. At this late date, with corn harvest initiated in southern counties, likely "trap" crops would be replanted corn in drowned out areas or late-market sweet corn. Initially, small larvae feed on the leaf surface, causing a "windowpane" effect, where the green tissue is removed and a transparent membrane remains. Whorl feeding by larger larvae appears as ragged-edged holes with excessive frass (caterpillar feces) being quite evident. The worms make their way into the ear and are capable of causing extensive kernel damage. 

Original news release