The high costs of developing new insecticide molecules combined with stringent regulatory laws for pesticide registration have encouraged more research with insecticidal compounds of plant origin. Moreover, insecticidal plant compounds may be less harmful to humans and to non-target organisms, and present new modes of action to control insect pests. Thereby, bioguided chromatographic fractionations of the ethanolic extract from flowers of Brugmansia suaveolens (Willd.) (Solanaceae) were performed in order to identify insecticidal chemical compounds able to protect stored beans against Bruchinae beetles. The chromatographic fractionations using silica column chromatography was based on results from toxicological bioassays (residual contact) using Zabrotes subfasciatus (Boheman) as a model insect. During the bioguided chromatographic fractionations, the bioactive fractions expressed their effects mainly by inhibiting the F1 progeny of Z. subfasciatus. Consequently, damages on bean grains were completely inhibited. Moreover, some fractions also killed adults of Z. subfasciatus, which demonstrated signs of hyperexcitation. The fraction BSHidAcF1-1 (150 mg Kg-1) killed 56% of adults of Z. subfasciatus, promoted egg deterrence, and drastically reduced eggadult viability.
How to cite this article:
Gabriel Luiz Padoan Gonçalves, Eduardo José Crevelin, Simone Possedente de Lira, José Djair Vendramim. 2019. Effects of Brugmansia suaveolens fractions on Zabrotes subfasciatus (Coleoptera: Chrysomelidae: Bruchinae). Journal of Biopesticides, 12(1):19-29.
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