Antifeedant Activities of the Erythrinaline Alkaloids from Erythrina latissima against Spodoptera littoralis (Lepidoptera noctuidae)

Abstract

The antifeedant activities of the Erythrina alkaloids from the seeds, seed pods and flowers of Erythrina latissima were investigated in laboratory dual- choice bioassays using third-instar Spodoptera littoralis (Boisduval) larvae. The new compound (+)-11 -methoxy-10-oxoerysotramidine (1) from the flowers, showed potent dose dependant activity at concentration ³ 500 ppm while (+)-10,11-dioxoerysotramidine (2) also new from the flowers showed potent dose dependant activity at concentration ³100 ppm. Three known compounds (+)-erysotrine, (+)-erysotramidine, (+)-erythraline, (+)-11 -hydroxyerysotramidine showed potent dose dependant antifeedant activity at concentrations ³100 ppm while (+)-10,11-dioxoerysotrine and (+)-11b- hydroxyerysotramidine also a known compounds showed potent dose dependant antifeedant activity at concentrations ³ 300 ppm. Three known compounds (+)-11 -methoxyerysotramidine, (+)-8-oxoerythraline and (+)-15(16)b-D-glucoerysodine showed no appreciable change in antifeedant activity with concentration change.