2.1 Sample collection and DNA extraction
Three Korean populations were collected from Jeju (33°23.18 N, 126°37.40 E), Muan (34°57.29 N, 126°20.46 E), and Miryang (35° 29.29 N, 128° 44.31 E). Two African populations originated from Nigeria and Benin and were reared in the Department of Entomology, Max Planck Institute for Chemical Ecology, Jena, Germany. Genomic DNA was extracted with DNAzol (Molecular Research Center, Cincinnati, OH) and quantified by Nanodrop (NanoDrop technologies, Wilmington, DE, USA).