Ratwatthananon, A. .; Yooboon, T. .; Bullangpoti, V. .; Pluempanupat, W. . Insecticidal Activity of Piper Retrofractum Fruit Extracts and Isolated Compounds Against Spodoptera Litura. Agr. Nat. Resour. 2020, 54, 447–452.