Duguetia lanceolata A. St.-Hil. Stem bark produces phenylpropanoids lethal to Spodoptera frugiperda (JE Smith) (Lepidoptera: Noctuidae). (January 2020) - Alves, Dejane S.
Abstract: The fall armyworm Spodoptera frugiperda (JE Smith) is a polyphagous insect that causes losses to farmers in the world. This work was aimed isolating and identifying the active substances produced by Duguetia lanceolata A. St. Hil for S. frugiperda . The dichloromethane soluble fraction from D. lanceolata stem bark, incorporated into an artificial diet for S. frugiperda, showed high insecticidal activity against this insect (LC50 = 295 μg mL −1 of diet). Its fractionation yielded two aporphine alkaloids and a mixture of trans -asarone and 2, 4, 5-trimethoxystyrene, which was active against S. frugiperda (LC50 = 124 μg mL −1 of diet). Both trans -asarone and 2, 4, 5-trimethoxystyrene were individually active against the insect, with the latter substance being more active (LT50 = 73 h) than the former (LT50 = 170 h). In conclusion, trans -asarone and 2, 4, 5-trimethoxystyrene are the substances produced by D. lanceolata that are active against S. frugiperda . Graphical abstract: Image 1 Highlights: The insecticidal activity of Duguetia lanceolata was evaluated against Spodoptera frugiperda. D. lanceolata produces metabolites that are toxic to S. frugiperda. The active substances are trans -asarone and 2, 4, 5-trimethoxystyrene. 2, 4, 5-trimethoxystyrene was more efficient than trans -asarone at increasing insect mortality.