Acaricidal and insecticidal activities of plants among Reunion Island's flora

Dorla Emmanuelle, Grondin Isabelle, Hue Thomas, Clerc Patricia, Deguine Jean-Philippe, Bialecki Anne, Laurent Philippe. 2019. Acaricidal and insecticidal activities of plants among Reunion Island's flora. In : Book of abstracts posters of the third international conference on Island ecology, evolution and conservation. Flores Olivier (ed.), Ah-Peng Claudine (ed.), Wilding Nicholas (ed.). Université de la Réunion. Saint-Denis : Université de la Réunion, Résumé, p. 63. International conference on Island ecology, evolution and conservation. 3, Saint-Denis, Réunion, 8 July 2019/13 July 2019.

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Abstract : La Reunion is among the world's top biodiversity hotspots with an endemic rate approximately of 40%. Due to the tropical climate, the island is subject to manifold crop pests and vector diseases. Among them, Bactrocera cucurbitae also known as the melon fly is considered as the major pest of Reunion island's agricultural activities. On the other hand, the cattle industry is affected by the tick Rhipicephalus microplus causing enormous losses in milk and hide production. With the purpose of discovering new biocidal natural extracts, several plants from the R´eunion island's flora were also explored. The essential oil (EO) of Peperomia borbonensis was evaluated by using a filter paper im-pregnated against the melon flies. The EO characterized by a high predominance of phenylpropanoids compounds with myristicin (39.5%) and elemicin (26.6%) as main components showed a LC50 and LC90 of 0.23 mg/cm2 and 0.34 mg/cm2. The median lethal time (LT50) was also determined to com-pare the toxicity of EO and the major constituents. The EO was the most potent insecticide (LT50= 97.97 min, SE = 1.72), followed by the mixture of myristicin and elemicin (1.4:1) (LT50= 126.84 min, SE = 2.11). Against Rhipicephalus microplus, the acaricidal activity was evaluated using the modified larval packet test (LPT). At a concentration of 5 %, the leaves of Peperomia borbonensis and the bark of Zanthoxylum heterophyllum extracts have showed a mortality rate of 100%. Monimia rotundifolia (65.7% of mortality) showed a medium activity and Psiadia amygdalina leaf extract had weak aca-ricidal activity with 31.8% of mortality. These plant extracts exhibited biocidal activities that were not described in the literature and that are congruent with traditional uses for some of them. This emphasize the fact that exploring R´eunion island biodiversity could lead to the discovery of new active molecules and the valorization of little known plants.

Mots-clés libres : Acaricidal, Biodiversity, Insecticidal, Plant extracts, Reunion Island

Auteurs et affiliations

  • Dorla Emmanuelle, Université de la Réunion (REU)
  • Grondin Isabelle, Université de la Réunion (REU)
  • Hue Thomas, IAC (NCL)
  • Clerc Patricia
  • Deguine Jean-Philippe, CIRAD-BIOS-UMR PVBMT (REU)
  • Bialecki Anne, Université de la Réunion (REU)
  • Laurent Philippe, Université de la Réunion (REU)

Source : Cirad-Agritrop (

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