Chemical Composition and Spectrum of Insecticidal Activity of the Essential Oils of Ocimum gratissimum L. and Cymbopogon citratus Stapf on the Main Insects of the Cotton Entomofauna in Côte d'Ivoire.

Autor: Kobenan KC; Félix Houphouët-Boigny University (UFHB), UFR Biosciences, Laboratory of Biotechnology, Agricultural and Biological Resources Valorisation, 22 BP 582, Abidjan, 22, Côte d'Ivoire.; National Center of Agronomic Research (CNRA), Cotton Research Station, Laboratory of Entomology, 01 BP 633 Bouaké 01, Côte d'Ivoire., Bini KKN; National Center of Agronomic Research (CNRA), Cotton Research Station, Laboratory of Entomology, 01 BP 633 Bouaké 01, Côte d'Ivoire., Kouakou M; National Center of Agronomic Research (CNRA), Cotton Research Station, Laboratory of Entomology, 01 BP 633 Bouaké 01, Côte d'Ivoire., Kouadio IS; Physiology and Biochemistry Research Laboratory, Department of Biology, Science Faculty, Selcuk University, Campus, Konya, Turkey., Zengin G; Physiology and Biochemistry Research Laboratory, Department of Biology, Science Faculty, Selcuk University, Campus, Konya, Turkey., Ochou GEC; National Center of Agronomic Research (CNRA), Cotton Research Station, Laboratory of Entomology, 01 BP 633 Bouaké 01, Côte d'Ivoire., Boka NRK; Félix Houphouët-Boigny University (UFHB), UFR Biosciences, Laboratory of Biotechnology, Agricultural and Biological Resources Valorisation, 22 BP 582, Abidjan, 22, Côte d'Ivoire., Menozzi P; National Center of Agronomic Research (CNRA), Cotton Research Station, Laboratory of Entomology, 01 BP 633 Bouaké 01, Côte d'Ivoire.; Agricultural Research Center for International Development (CIRAD), Research Unit 115 AIDA (Agroecology and Sustainable Intensification of Annual Crops) -, France., Ochou OG; National Center of Agronomic Research (CNRA), Cotton Research Station, Laboratory of Entomology, 01 BP 633 Bouaké 01, Côte d'Ivoire., Dick AE; Félix Houphouët-Boigny University (UFHB), UFR Biosciences, Laboratory of Biotechnology, Agricultural and Biological Resources Valorisation, 22 BP 582, Abidjan, 22, Côte d'Ivoire.
Jazyk: angličtina
Zdroj: Chemistry & biodiversity [Chem Biodivers] 2021 Nov; Vol. 18 (11), pp. e2100497. Date of Electronic Publication: 2021 Sep 29.
DOI: 10.1002/cbdv.202100497
Abstrakt: Among the alternatives to environmentally toxic and socio-economically unacceptable chemical pesticides, essential oils from Ocimum gratissimum and Cymbopogon citratus were tested on the main pests and beneficial insects of the cotton plant in Côte d'Ivoire. After extraction and chemical analysis of the essential oils, field trials were carried out using a Fisher block system with three treatment repetitions where their effects compared with those of a registered synthetic insecticide (IBIS A 52 EC). Foliar applications of the products were carried out in accordance with the cotton plant protection extension programme in Côte d'Ivoire from the 45th to the 115th day after plant emergence, with one application every fortnight. Twenty-three and forty compounds representing about 96 and 99 % of the oil composition of O. gratissimum and C. citratus respectively were elucidated. The most abundant compounds were p-cymene and thymol (O. gratissimum) and myrcene, neral and geranial (C. citratus). The essential oil of O. gratissimum at concentrations of 2 and 5 % showed insecticidal activity on all pests (biting-sucking and carpophagous), except the phyllophagous Syllepte derogata. C. citratus, at a low concentration (1 %), was particularly toxic to whiteflies (Bemisia tabaci), however, it favoured the action of beneficial insects, specifically black ants and ladybirds in the cotton plots, unlike the chemical product. EO of O. gratissimum (1.60 and 4.62 mg GALAE/g, respectively) and C. citratus (2.26 and 2.78 mg GALAE, respectively) exhibited also significant acetyl and butyryl cholinesterase inhibitors. Insecticide formulations based on the essential oils of O. gratissimum and C. citratus offer favourable prospects for their use in cotton cultivation as an alternative to chemical pesticides.
(© 2021 Wiley-VHCA AG, Zurich, Switzerland.)
Databáze: MEDLINE
Externí odkaz: