The true armyworm (Pseudaletia unipuncta) causes some damage in parts of the state almost every year. True armyworm should not be confused with “fall armyworm,” another corn insect pest that occurs later in the season, usually only on very late planted corn. The true armyworm is an early season pest that attacks grass crops like small grains and corn. Armyworms climb into corn whorls and “rag” the leaves from the outer edges of the leaves in towards the midrib. When infestations are severe, only the midribs will be left behind.