Larvicidal efficacy and chemical constituents of O. gratissimum L. (Lamiaceae) essential oil against Aedes albopictus Skuse (Diptera: Culicidae)

Abstract

The current study accentuates the use of botanicals as an alternative to the chemical compounds in vector control by estimating the mosquito larvicidal potential of Ocimum gratissimum L. leaf essential oil against the fourth instar larvae of Aedes albopictus Skuse (Diptera: Culicidae). The chemical composition of essential oil from leaves was evaluated using gas chromatography-mass spectrometry (GC/MS) analysis. GC/MS revealed that the essential oil of O. gratissimum contained 51 compounds. The major chemical constituents identified were 3-allyl-6-methoxyphenol (19.30%), 4-(5-ethenyl-1-azabicyclo (2, 2, 2) octan-2) (16.82%), 1-(2, 5-dimethoxyphenyl)-propanol (12.23%) and 1-(1-hydroxybutyl)-2, 5-dimethoxybenzene (5.53%). The essential oil showed pertinent larvicidal effect, and the LC50 value in 24 h was 26.10 ppm (LC90 = 82.83 ppm). Aromatic plants and their essential oils are very important sources of many compounds that are used for different applications, and they are more promising pesticides or insecticides for control of mosquito populations than synthetic ones. The results of the present investigation justify the larvicidal potential of leaf essential oil of O. gratissimum as a safer and more effective larvicide against A. albopictus.

The application of essential oils as a next-generation of pesticides: recent developments and future perspectives

“…Li et al [23] applied EO obtained by water distillation from the aerial parts of Clinopodium chinense (Benth.) Kuntze against the booklice (Liposcelis bostrychophila), with a 50% lethal concentration (LC 50 ) of 215.25 μg/cm 2 (contact), respectively, 423.39 μg/L air (fumigant), whereas Sumitha and Thoppi [24] used Ocimum gratissimum L. leaf EO as insecticidal agent against Aedes albopictus Skuse, with LC 50 value of 26.10 mg/L and LC 90 of 82.83 mg/L, at 24 h.…”

Produtos naturais de origem vegetal como ferramentas alternativas para o controle larvário de Aedes aegypti e Aedes albopictus

“…aegypti e Ae. albopictus, o que resultou na análise, ao final da seleção, de Govindarajan et al, 2013a 71 Conti et al, 2012 72 Conti et al, 2010 65 Govindarajan et al, 2013b 73 Sumitha & Thoppil, 2016 74 Conti et al, 2010 65 Mathew As plantas produzem uma quantidade imensurável de compostos bioativos, classificados como metabólitos secundários, os quais são dotados de estruturas químicas de altíssima complexidade e com um espectro de funções bastante complexo, uma vez que não cumprem um papel específico no metabolismo, no crescimento e na divisão celular do organismo produtor. Estão, por outro lado, intrinsecamente relacionados aos mecanismos de defesa do vegetal em face dos mais distintos fatores de pressão de seleção do ambiente, em especial aqueles voltados contra o ataque de herbívoros 14 .…”

A systematic review on COVID-19 pandemic with special emphasis on curative potentials of Nigeria based medicinal plants

“…2015 31 Mondia whitei Isirigun 2-Hydroxy-4-methoxybenzaldehyde Kokwaro, 1993 32 Morinda lucida Oruwo asperuloside, asperulosidic acid, stigmasterol, β-sitosterol, cycloartenol, campesterol and 5,15-O-dimethylmorindol Chithambo et al., 2017 34 Nauclealatifolia Egberesi Gberesi strictosamide, naucleamide A, naucleamide F, quinovic acid-3- O -®-rhamnosylpyranoside, and quinovic acid 3- O -®-fucosylpyranoside Ata et al., 2009 35 Ocimumgratissimum Efinrin-nla 3-allyl-6-methoxyphenol, 4-(5-ethenyl-1-azabicyclo (2, 2, 2) octan-2), 1-(2, 5-dimethoxyphenyl) -propanol and 1-(1-hydroxybutyl) -2, 5-dimethoxybenzene in the concentration of 19.30 %, 16.82 %, 12.23 %, and 5.53 % respectively. Sumitha and Thoppil, 2016 36 Parquetina nigrescens Ogbo cardenolides Nafiu et al. 2014 37 Pergularia daemia Atufa, isirigun 38 Physalis angulata koropo Physalins F and D ( Sá et al.,2011 ).…”