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Article

Effects of Essential Oils from 24 Plant Species on Sitophilus zeamais Motsch (Coleoptera, Curculionidae)

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Department of Chemistry, Faculty of Sciences, Universidad Nacional de Colombia-Sede Bogotá, Bogotá 111321, Colombia
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Department of Mathematics, Faculty of Engineering, Pontificia Universidad Javeriana, Bogotá 110231, Colombia
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Department of Chemistry, Faculty of Sciences, Pontificia Universidad Javeriana, Bogotá 110231, Colombia
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Author to whom correspondence should be addressed.
Academic Editor: Dionyssios Ch. Perdikis
Insects 2021, 12(6), 532; https://doi.org/10.3390/insects12060532
Received: 12 March 2021 / Revised: 21 May 2021 / Accepted: 24 May 2021 / Published: 8 June 2021
(This article belongs to the Section Insect Pest and Vector Management)
The maize weevil (Sitophilus zeamais Motsch) is a major pest in stored grain, responsible for significant economic losses and having a negative impact on food security. Due to the harmful effects of traditional chemical controls, it has become necessary to find new insecticides that are both effective and safe. In this sense, plant-derived products such as essential oils (EOs) appear to be appropriate alternatives. Therefore, laboratory assays were carried out to determine the chemical compositions, as well as the bioactivities, of various EOs extracted from aromatic plants on the maize weevil. The results showed that the tested EOs were toxic by contact and/or fumigance, and many of them had a strong repellent effect. Samples of 14 EOs and 17 of their main constituents (monoterpenes) had high fumigant toxicity against S. zeamais adults and might constitute a viable control method of this pest.
Chemical control of the maize weevil (Sitophilus zeamais) has been ineffective and presents serious collateral damage. Among plant-derived insecticides, essential oils (EOs) are suitable candidates to control this stored products pest. In this work, the insecticidal activities of 45 natural EOs against S. zeamais adults were screened, and the most promising ones (24 EOs) were characterized by GC–MS. The repellent and toxic effects (contact and fumigant) of these 24 EOs were determined, and by a cluster analysis they were classified into two groups considering its fumigant activity and contact toxicity. For the EOs with the highest fumigant potential (14 oils) and their main active constituents (17 compounds), lethal concentrations were determined. The most active EOs were those obtained from L. stoechas and L. alba, with LC50 values of 303.4 and 254.1 µL/L air and characterized by a high content of monoterpenes. Regarding the major compounds, the oxygenated monoterpenes R-(+)-pulegone (LC50 = 0.580 mg/L air), S-(-)-pulegone (LC50 = 0.971 mg/L air) and R-(-)-carvone (LC50 = 1.423 mg/L air) were the most active, as few variations in their concentrations significantly increased insect mortality. View Full-Text
Keywords: essential oil; Sitophilus zeamais; fumigant toxicity; topic toxicity; repellent essential oil; Sitophilus zeamais; fumigant toxicity; topic toxicity; repellent
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MDPI and ACS Style

Patiño-Bayona, W.R.; Nagles Galeano, L.J.; Bustos Cortes, J.J.; Delgado Ávila, W.A.; Herrera Daza, E.; Suárez, L.E.C.; Prieto-Rodríguez, J.A.; Patiño-Ladino, O.J. Effects of Essential Oils from 24 Plant Species on Sitophilus zeamais Motsch (Coleoptera, Curculionidae). Insects 2021, 12, 532. https://doi.org/10.3390/insects12060532

AMA Style

Patiño-Bayona WR, Nagles Galeano LJ, Bustos Cortes JJ, Delgado Ávila WA, Herrera Daza E, Suárez LEC, Prieto-Rodríguez JA, Patiño-Ladino OJ. Effects of Essential Oils from 24 Plant Species on Sitophilus zeamais Motsch (Coleoptera, Curculionidae). Insects. 2021; 12(6):532. https://doi.org/10.3390/insects12060532

Chicago/Turabian Style

Patiño-Bayona, William R., Leidy J. Nagles Galeano, Jenifer J. Bustos Cortes, Wilman A. Delgado Ávila, Eddy Herrera Daza, Luis E.C. Suárez, Juliet A. Prieto-Rodríguez, and Oscar J. Patiño-Ladino 2021. "Effects of Essential Oils from 24 Plant Species on Sitophilus zeamais Motsch (Coleoptera, Curculionidae)" Insects 12, no. 6: 532. https://doi.org/10.3390/insects12060532

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