Author(s): Souto RN, Harada AY, Andrade EH, Maia JG
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Abstract Pepper plants in the genus Piper (Piperales: Piperaceae) are common in the Brazilian Amazon and many produce compounds with biological activity against insect pests. We evaluated the insecticidal effect of essential oils from Piper aduncum, Piper marginatum (chemotypes A and B), Piper divaricatum and Piper callosum against workers of the fire ant Solenopsis saevissima (Smith) (Hymenoptera: Formicidae), as well as their chemical composition by gas chromatography and gas chromatography-mass spectrometry. The lowest median lethal concentration (LC50) in 48 h was obtained with the oil of P. aduncum (58.4 mg/L), followed by the oils of P. marginatum types A (122.4 mg/L) and B (167.0 mg/L), P. divaricatum (301.7 mg/L), and P. callosum (312.6 mg/L). The major chemical constituents were dillapiole (64.4\%) in the oil of P. aduncum; p-mentha-1(7),8-diene (39.0\%), 3,4-methylenedioxypropiophenone (19.0\%), and (E)-β-ocimene (9.8\%) in P. marginatum chemotype A and (E)-isoosmorhizole (32.2\%), (E)-anethole (26.4\%), isoosmorhizole (11.2\%), and (Z)-anethole (6.0\%) in P. marginatum chemotype B; methyleugenol (69.2\%) and eugenol (16.2\%) in P. divaricatum; and safrole (69.2\%), methyleugenol (8.6\%), and β-pinene (6.2\%) in P. callosum. These chemical constituents have been previously known to possess insecticidal properties.
This article was published in Neotrop Entomol
and referenced in Medicinal & Aromatic Plants