Antifeedant Activities of the Erythrinaline Alkaloids from Erythrina latissima against Spodoptera littoralis (Lepidoptera noctuidae)
Cornelius, Wanjala W
Obiero, George O
Lutta, Kweyu P
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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.