Armyworms are the caterpillars of some members of two genera:

• Many Spodoptera including:
  • African armyworm (Spodoptera exempta) (Africa)
  • Fall armyworm (Spodoptera frugiperda) (North and South America)
  • Lawn armyworm (Spodoptera mauritia)
• Some Mythimna (moth) including:
  • Common armyworm or true armyworm (Mythimna unipuncta) (North and South America)
  • Northern armyworm, Oriental armyworm or rice ear-cutting caterpillar (Mythimna separata) (Asia)