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Evaluation of Cymbopogon flexuosus and Alpinia zerumbet essential oils as biopesticides against Callosobruchus maculatus

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Abstract

This study aimed to investigate the effects of the essential oils of Cymbopogon flexuosus and Alpinia zerumbet in the treatment of cowpea [Vigna unguiculata (L.) Walp.] grains under storage conditions for the management of Callosobruchus maculatus. Measurements of the effects of these essential oils were based on contact, fumigation, and repellency tests. The lethal concentrations (LC50) obtained from the contact tests were 0.65 and 11.23 µL/20 g for the essential oils of C. flexuosus and A. zerumbet, respectively. The impact on F1 offspring increased with increasing concentrations of essential oils. The LC50 values obtained from the fumigation tests were 2.34 and 8.69 µL/L of air for the C. flexuosus and A. zerumbet, respectively. Regarding repellency, both essential oils were classified as neutral. C. flexuosus was more toxic than A. zerumbet in the contact test; however, there was no difference in their toxicities found in the fumigation test. The essential oils of C. flexuosus and A. zerumbet presented a great insecticidal potential against C. maculatus, therefore, can be an environmentally sustainable alternative to synthetic chemical fumigants.

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Acknowledgements

To the Foundation of Support for Research and Scientific and Technological Development of Maranhão (FAPEMA) for the scholarship and funding granted.

Funding

Foundation of Support for Research and Scientific and Technological Development of Maranhão (FAPEMA) for the scholarship and funding granted.

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Barbosa, DRS, Santos, R.B.V. and Santos, F.M.P. participated in all stages of the manuscript; Silva, GN contributed to writing the manuscript and statistical analysis; Dutra, KA, and Navarro, DMAF contributed with the chromatographic analysis. Oliveira Neto, F.M. and Silva Junior, P.J. participated in the practical implementation of the bioassays.

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Correspondence to Douglas Rafael e Silva Barbosa.

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Barbosa, D.R.e., dos Santos, R.B.V., Santos, F.M.P. et al. Evaluation of Cymbopogon flexuosus and Alpinia zerumbet essential oils as biopesticides against Callosobruchus maculatus. J Plant Dis Prot 129, 125–136 (2022). https://doi.org/10.1007/s41348-021-00511-5

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  • DOI: https://doi.org/10.1007/s41348-021-00511-5

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