Insects
UT strain of S. ricini and Nagano strain of S. c. pryerilarvae were provided from the National BioResource Project (NBRP;http://shigen.nig.ac.jp/wildmoth/ ). While S. ricini larvae were reared on Ricinus communis leaves under long-day conditions (16 h light/8 h dark) at 25°C, S. c. pryeri larvae were reared onAilanthus altissima. F1 interspecific hybrids were obtained by crossing S. c. pryeri female and S. ricini male. F1 individuals and BC1individuals were reared on Ricinus communis leaves under long-day conditions (16 h light/8 h dark) at 25°C.