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Insecticidal activity of the leaf essential oil of Peperomia borbonensis MIQ.(Piperaceae) and its major components against the melon fly Bactrocera cucurbitae (Diptera: Tephritidae)

Dorla E., Gauvin-Bialeck A., Deuscher Z., Allibert A., Grondin I., Deguine J.P., Laurent P.. 2017. Chemistry and Biodiversity, 14 (6) : e1600493 (9 p.).

The essential oil from the leaves of Peperomia borbonensis from Réunion Island was obtained by hydrodistillation and characterized using GC-FID, GC/MS and NMR. The main components were myristicin (39.5%) and elemicin (26.6%). The essential oil (EO) of Peperomia borbonensis and its major compounds (myristicin and elemicin), pure or in a mixture, were evaluated for their insecticidal activity against Bactrocera cucurbitae (Diptera: Tephritidae) using a filter paper impregnated bioassay. The concentrations necessary to kill 50% (LC50) and 90% (LC90) of the flies in three hours were determined. The LC50 value was 0.23 ± 0.009 mg/cm2 and the LC90 value was 0.34 ± 0.015 mg/cm2 for the EO. The median lethal time (LT50) was determined to compare the toxicity of EO and the major constituents. The EO was the most potent insecticide (LT50 = 98 ± 2 min), followed by the mixture of myristicin and elemicin (1.4:1) (LT50 = 127 ± 2 min) indicating that the efficiency of the EO is potentiated by minor compounds and emphasizing one of the major assets of EOs against pure molecules. (Résumé d'auteur)

Mots-clés : peperomia; insecticide d'origine végétale; huile essentielle; propriété insecticide; composition chimique; composé aromatique; efficacité; bactrocera cucurbitae; cucumis melo; feuille; distillation; réunion; peperomia borbonensis

Thématique : Ravageurs des plantes; Physiologie et biochimie végétales; Traitement des produits agricoles non alimentaires

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