Chemical Composition of the Essential Oil of Nigeria Grown Hoslundia oppositaVahl (Lamiaceae) Dried Leaves and Its Bioactivity against Cowpea Seed Bruchid

Due to several ecological and human hazards of synthetic pesticides in postharvest crop protection, there is the need to search for eco-friendly alternatives. In this study, chemical composition and insecticidal activities of essential oil (EO) obtained from Hoslundia opposita dried leaves were eval...

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Bibliographic Details
Published in:Chemistry & biodiversity 2017-06, Vol.14 (6)
Main Authors: Babarinde, Samuel Adelani, Pitan, Olufemi Olutoyin Richard, Olatunde, Ganiyu Olatunji, Ajala, Michael Oluwole
Format: Article
Language:English
Subjects:
Agrochemicals
Bioassays
Biochemistry
Biocompatibility
Biomedical materials
Caryophyllene
Chemical composition
Cineole
Concentration (composition)
Ecology
Emergence
Essential oils
Exposure
Farnesene
Fumigation
Gas chromatography
Germacrene
Hazards
Leaves
Monoterpenes
Mortality
Natural gas
Offspring
Oils & fats
Oviposition
Oxygenated
Pesticides
Plant protection
Progeny
Sabinene
Searching
Seeds
Surgical implants
Terpineol
α-Pinene
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Summary:Due to several ecological and human hazards of synthetic pesticides in postharvest crop protection, there is the need to search for eco-friendly alternatives. In this study, chemical composition and insecticidal activities of essential oil (EO) obtained from Hoslundia opposita dried leaves were evaluated against cowpea seed bruchid. Eight constituents, predominated by oxygenated monoterpenes (78.86%), were identified using Gas Chromatography (GC)/MS. The constituents were 1,8-cineole (1; 61.15%), followed by [alpha]-terpineol (2; 16.81%), [beta]-phellandrene (3; 13.24%), [beta]-farnesene (4; 3.55%), [alpha]-pinene (5; 1.89%), Germacrene D (6; 1.83%), cis-sabinene hydrate (7; 0.90%) and caryophyllene (8; 0.63%). In fumigation bioassay, at 6 h after exposure (HAE), 0.78 ml EO/l air caused 35.33% mortality which was significantly lower than 60.90% and 63.6% observed at 3.15 and 6.25 ml/l air, respectively. Mortality reached 90.0% at 24 HAE regardless of the applied concentration. Lethal time for 50% of the bruchids (LT50) at concentration of 0.78 ml/l air (6.89 h) was higher than the LT50 at 3.15 and 6.25 ml/l air (4.72 and 4.44 h, respectively). H. oppositaEO reduced Callosobruchus maculatus oviposition, while progeny emergence observed in EO-treated seeds (2.42 - 25.73) was significantly (P < 0.05) lower than 51.56 observed in control. The results confirm H. oppositaEO's potentials for control of cowpea bruchids.
ISSN:1612-1872
1612-1880
DOI:10.1002/cbdv.201600418