Volume 24, Issue 1, August 2018, Pages 389–397
Koffi Christophe KOBENAN1, Germain Elisabeth Cynthia OCHOU2, Malanno KOUAKOU3, Acka Emmanuel DICK4, and Ochou Germain OCHOU5
1 Laboratory of Plant Physiology, Félix HOUPHOUËT-BOIGNY University (UFHB), Côte d’Ivoire
2 Laboratory of Cytology and Biology, Nangui Abrogoua University (UNA), Côte d’Ivoire
3 Laboratory of Agricultural Entomology, National Center for Agricultural Research (CNRA), Côte d’Ivoire
4 Laboratory of Plant Physiology, Félix HOUPHOUËT-BOIGNY University (UFHB), Côte d’Ivoire
5 Laboratory of Agricultural Entomology, National Center for Agricultural Research (CNRA), Côte d’Ivoire
Original language: English
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
In Côte d'Ivoire, the loss of cotton yield is mainly due to attacks caused by pest insects such as, the pink worm, Pectinophora gossypiella Saunders. For decades, the repeated use of chemical insecticides to control these pests has threatened the viability of the production system. Faced with the negative consequences linked to the use of synthetic chemicals, the search for alternative methods is essential. The objective of this study is therefore to evaluate the chemical properties and the insecticidal activity of essential oils extracted from Cymbopogon citratus, Cymbopogon nardus and Citrus sp on P. gossypiella. In the laboratory, nine concentrations (0.25; 0.50; 1; 2; 4; 8; 16; 32 and 64 %) for each of the three essential oils, with three replications, were tested by topical application method on adults of the pest using a micro-applicator. Results showed that the pest developed variable levels of sensitivity to those plant oils. The one extracted from C. citratus was the most toxic to P. gossypiella. The lethal concentrations (LC50 and LC90) measured were 1.67 and 4.07 % respectively. Furthermore, the results of the gas chromatography coupled mass spectrometry (GS/SM) analysis indicated that the essential oils of the three aromatic plants evaluated were strongly composed of monoterpenes (91.57-100 %). C. citratus extract was the richest in oxygenated monoterpenes (73.71 %) followed by C. nardus extract (46.59 %). The essential oil of C. citratus can be used rationally as an alternative option to chemical in the current cotton pest control program in Côte d’Ivoire.
Author Keywords: Cotton, Pectinophora gossypiella, essential oils, Cymbopogon citratus, Cymbopogon nardus, Citrus sp.
Koffi Christophe KOBENAN1, Germain Elisabeth Cynthia OCHOU2, Malanno KOUAKOU3, Acka Emmanuel DICK4, and Ochou Germain OCHOU5
1 Laboratory of Plant Physiology, Félix HOUPHOUËT-BOIGNY University (UFHB), Côte d’Ivoire
2 Laboratory of Cytology and Biology, Nangui Abrogoua University (UNA), Côte d’Ivoire
3 Laboratory of Agricultural Entomology, National Center for Agricultural Research (CNRA), Côte d’Ivoire
4 Laboratory of Plant Physiology, Félix HOUPHOUËT-BOIGNY University (UFHB), Côte d’Ivoire
5 Laboratory of Agricultural Entomology, National Center for Agricultural Research (CNRA), Côte d’Ivoire
Original language: English
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
In Côte d'Ivoire, the loss of cotton yield is mainly due to attacks caused by pest insects such as, the pink worm, Pectinophora gossypiella Saunders. For decades, the repeated use of chemical insecticides to control these pests has threatened the viability of the production system. Faced with the negative consequences linked to the use of synthetic chemicals, the search for alternative methods is essential. The objective of this study is therefore to evaluate the chemical properties and the insecticidal activity of essential oils extracted from Cymbopogon citratus, Cymbopogon nardus and Citrus sp on P. gossypiella. In the laboratory, nine concentrations (0.25; 0.50; 1; 2; 4; 8; 16; 32 and 64 %) for each of the three essential oils, with three replications, were tested by topical application method on adults of the pest using a micro-applicator. Results showed that the pest developed variable levels of sensitivity to those plant oils. The one extracted from C. citratus was the most toxic to P. gossypiella. The lethal concentrations (LC50 and LC90) measured were 1.67 and 4.07 % respectively. Furthermore, the results of the gas chromatography coupled mass spectrometry (GS/SM) analysis indicated that the essential oils of the three aromatic plants evaluated were strongly composed of monoterpenes (91.57-100 %). C. citratus extract was the richest in oxygenated monoterpenes (73.71 %) followed by C. nardus extract (46.59 %). The essential oil of C. citratus can be used rationally as an alternative option to chemical in the current cotton pest control program in Côte d’Ivoire.
Author Keywords: Cotton, Pectinophora gossypiella, essential oils, Cymbopogon citratus, Cymbopogon nardus, Citrus sp.
How to Cite this Article
Koffi Christophe KOBENAN, Germain Elisabeth Cynthia OCHOU, Malanno KOUAKOU, Acka Emmanuel DICK, and Ochou Germain OCHOU, “Essential oils of Cymbopogon citratus (DC.) Stapf, Cymbopogon nardus L. and Citrus sp: Insecticidal activity on the Pink Bollworm Pectinophora gossypiella Saunders (Lepidoptera; Gelechiidae) and prospects for cotton pest management in Côte d'Ivoire,” International Journal of Innovation and Applied Studies, vol. 24, no. 1, pp. 389–397, August 2018.
