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Repellence and fumigant toxicity of essential oils of Ocimum gratissimum and Ocimum kilimandscharicum on Tuta absoluta (Lepidoptera: Gelechiidae)

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Abstract

Tuta absoluta Meyrick originates in South America and is now one of the most important insect pests of Solanaceae in different parts of the world, including Africa. Its control has relied primarily on chemical insecticides, which are associated with negative ecological effects. In the present study, essential oils of Ocimum gratissimum and O. kilimandscharicum were tested for repellence and fumigant toxicity on the adult stages under laboratory conditions. The oil of O. gratissimum was more repellent, but its toxicity was comparable with that of O. kilimandscharicum. The major constituents of O. gratissimum were methyl eugenol (39.5%) and eugenol (29.7%). Those of O. kilimandscharicum were camphor (47.1%) and 1.8-cineole (19.3%). Eugenol (LC50 of 0.24 μl/ml, 83.3%, RI50 = 0.15) and camphor (LC50 of 0.23 μl/ml, 89.5%, RI50 = 0.13) were more toxic (at 1 μl/ml for 24 h) and repellent than the other constituents. The results show potential of the essential oils for use in integrated management of the tomato pest.

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Acknowledgements

We gratefully acknowledge the financial support for the German Academic Exchange Service In-Region scholarship for funding FREE. SAM thanks the Federal Ministry of Cooperation and Development (BMZ), Germany for providing the financial support through ICIPE Tuta absoluta IPM project.

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Authors and Affiliations

  1. University Institute of Technology, University of Ngaoundere, P.O. Box 455, Ngaoundere, Cameroon

    Flaure Rosette Ehawa Essoung

  2. Department of Chemistry, Faculty of Science, University of Buea, P.O. Box 63, Buea, Cameroon

    Alain Tcho Tadjong

  3. Chemistry Department, School of Pure and Applied Sciences, Kenyatta University, P.O. Box 43844-00100, Nairobi, Kenya

    Sumesh Chander Chhabra & Ahmed Hassanali

  4. International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772-00100, Nairobi, Kenya

    Samira Abuelgasim Mohamed

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  1. Flaure Rosette Ehawa Essoung
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Correspondence to Flaure Rosette Ehawa Essoung.

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Essoung, F.R.E., Tadjong, A.T., Chhabra, S.C. et al. Repellence and fumigant toxicity of essential oils of Ocimum gratissimum and Ocimum kilimandscharicum on Tuta absoluta (Lepidoptera: Gelechiidae). Environ Sci Pollut Res 27, 37963–37976 (2020). https://doi.org/10.1007/s11356-020-09773-2

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