Larvae of Spodtopera species are often called armyworms because of their behaviour of moving across food sources in large numbers in an army-like fashion. As larvae, they can quickly consume available food sources resulting in considerable damage.  FAW is not the only serious armyworm found in Southeast Asia and it's important to be able to identify and manage them all as part of a sustainable integrated management approach to crop health and protection. Spodoptera littoralis has its own page for further information (see below)