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Repellency of Wild Oregano Plant Volatiles, Plectranthus Amboinicus, and Their Essential Oils to the Silverleaf Whitefly, Bemisia Tabaci, on Tomato

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Abstract

The Bemisia tabaci (Gennadius) whitefly is a major economically damaging pest of many crops such as tomato (Solanum lycopersicum L.). Pesticides are widely used to control B. tabaci while the use of aromatic plants is an alternative control method. The aim of this study was to assess the B.tabaci repellent effect of wild oregano, Plectranthus amboinicus (Lour.) Spreng, a widespread aromatic plant in the West Indies. We tested three origins of wild oregano, including northern, central, and southern Martinique (French West Indies). Our results showed that all essential oils of wild oregano had either masking properties or were true repellents—the mean percentage of whiteflies present in the upper part of the still-air olfactometer was 1.3- to 1.9-fold lower than in the controls. The ethanolic solution of volatile organic compounds of wild oregano from southern Martinique also had a true repellent effect—the mean percentage of whiteflies present in the upper part of the still-air olfactometer was 1.3-fold lower than in the controls. Moreover, in a greenhouse insect-proof cage, there were 1.5 fewer adult whiteflies on tomato intercropped with wild oregano from southern Martinique than on tomato alone after 96 h exposure. Our study generated further insight into the potential of P. amboinicus for B. tabaci biocontrol on tomato crops. Wild oregano extracts were repellent to B. tabaci and could be used as a companion plant to prevent whitefly infestations on tomato crops. However, the B. tabaci behavior depends on the plant origin.

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Data Availability

The data that support the finding of this study are available from CIRAD Dataverse (https://doi.org/10.18167/DVN1/PGG1HT).

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Acknowledgements

We thank Dr. Agnès Chartier for her collaboration on the GC-MS analysis.

Funding

The research reported in this publication was supported by AFB as part of the “Sustainable crop protection without neonicotinoids: improving the emergent and opening innovative perspectives” call launched by the French Ministries of Ecology (MTES), Agriculture (MAA), Health (MSS), and Research (MESRI).

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Conceptualization and methodology: Béatrice Rhino and Emilie Deletre; Formal analysis and investigation: Cyrane Pouët and Béatrice Rhino. Writing — original draft preparation: Cyrane Pouët; Writing — review and editing: all authors; Funding acquisition: Béatrice Rhino

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Correspondence to Béatrice Rhino.

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The authors declare no competing interests.

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Edited by Andres Gonzáles Ritzel

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Supplementary Information

Figure S1

GC-MS Chromatograms (TIC) of essential oil solution of wild oregano from different origins [northern (WO1), central (WO2) and southern (WO3) Martinique (French Indies)] and essential oil of winter savory. The peak numbers correspond to the compound numbers in Table 2. (PNG 377 kb)

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Figure S2

GC-MS Chromatograms (TIC) of ethanolic VOC solution of wild oregano from different origins [northern (WO1), central (WO2) and southern (WO3) Martinique (French Indies)] and essential oil of winter savory. The peak numbers correspond to the compound numbers in Table 2. (PNG 380 kb)

High Resolution Image (TIF 93 kb)

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Pouët, C., Deletre, E. & Rhino, B. Repellency of Wild Oregano Plant Volatiles, Plectranthus Amboinicus, and Their Essential Oils to the Silverleaf Whitefly, Bemisia Tabaci, on Tomato. Neotrop Entomol 51, 133–142 (2022). https://doi.org/10.1007/s13744-021-00921-y

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  • DOI: https://doi.org/10.1007/s13744-021-00921-y

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