The fall armyworm (Spodoptera frugiperda) is a major agricultural pest native to the Americas. It is widely distributed throughout the Western Hemisphere. It damages crops such as maize, wheat, rice, sorghum, cotton, herbage and various weeds, and reportedly feeds on more than 300 species (Montezano et al. 2018). Fall armyworm is a typical lepidoptera pest and goes through four life stages: egg, larva, pupa and adult. Adults can lay eggs between 1000 and 2000 and complete a life cycle within about 30 days, reproducing at a fast speed. There are two biotypes of fall armyworm: Corn-biotype (C-strain) and Rice-biotype (R-strain). Both biotypes are widely distributed throughout the Americas. C-strain mainly feeds on maize, sorghum, sugarcane, wheat, and cotton plants, while R-strain mainly feeds on grass and rice plants (Murúa et al. 2015). They occasionally graze on plants in each other's host ranges. The two biotypes can be accurately identified using either TPI (Triose-Phosphate Isomerase) or COI (Cytochrome Oxidase Subunit I) molecular markers (Nagoshi et al. 2012). In the Americas, fall armyworm is controlled mainly by chemical pesticides and Bt crops. Long-term use of chemical pesticides has resulted in widespread resistance, which has been reported throughout the Americas. Resistance to Bt crops has also recently been found, especially in South American countries.