Abstract

JARAMILLO-COLORADO, BEATRIZ EUGENIA; VEGA-DIAZ, RAFAEL  and  PINO-BENITEZ, CRUZ NAYIVE. Volatile chemical composition of Colombian Plectranthus amboinicus (Lour.) Spreng. essential oil and its biocidal action against Tribolium castaneum (Herbst). rev.colomb.cienc.hortic. [online]. 2022, vol.16, n.1, e13413.  Epub Jan 14, 2023. ISSN 2011-2173.  https://doi.org/10.17584/rcch.2022v16i1.13413.

Plectranthus amboinicus (Lour.) Spreng. is an herbaceous and aromatic plant that belongs to the Lamiaceae family. In this research work, the repellent and insecticidal activity of the essential oil (EO) of P. amboinicus from the Condoto township in the department of Choco (Colombia) against the flour weevil Tribolium castaneum (Herbst) was studied. EO was isolated by the hydrodistillation technique. The identification of the volatile metabolites of P. amboinicus EO was done through gas chromatography coupled to mass spectrometry (GC / MS). The contact method was used for the bioassay of the essential oil’s repellent and fumigant activities. In the Plectranthus amboinicus EO, fifteen compounds were found. The major compound was carvacrol (75.9%) followed by α-bergamotene, p-cymene, α-humulene, 4-terpineol, caryophyllene oxide, β-guaiene, 1-octen-3-ol, α-muurolene, caryophyllene,3-hexen-2-ol, γ-terpinene, isothymol, 2-carene and β-bisabolene, respectively. The highest repellent activity obtained was 83.33 and 9.67% at a concentration of 0,1% with exposure times of 2 and 4 hours, respectively. The fumigant activity was 100% at a concentration of EO 250 μL L-1. The results indicated that the natural compounds tested may be useful alternatives to control T. castaneum infestation.

Keywords : essential oils; repellent activity; insecticidal activity; bioprospecting.

        · abstract in Spanish     · text in English     · English ( pdf )