Chemical composition and insecticide activity of lemon verbena essential oil
Abstract:
Essential oil extracted from the leaves of Lemon verbena، Lippia citriodora Kunth (Verbenaceae) was tested for fumigant toxicity in the laboratory against two stored-product insects Tribolium confusum Jacquelin du Val and Callosobruchus maculatus (F.). The chemical composition of the isolated oil was examined by GC-MS. The major compounds were citral (11. 3%)، limonene (10. 6%)، neral (7. 9%)، 4-phenyl undecan-4-ol (7. 7%)، α-curcumene (6. 5%)، α-cedrol (4. 5%) and caryophyllene oxide (4. 5%). Furthermore، lesser amounts of the other components include carveol (3. 7%)، linalool (3. 5%)، α-pinene (3. 2%)، caryophyllene (2. 8%) and geranyl acetat (1. 8%) were existed in the essential oil. In the fumigant toxicity set at 27 ± 1 °C and 65 ± 5% R. H.، darkness condition and 24 h exposure time، considerable differences in mortality of insect to essential oil vapor were observed. C. maculatus (LC50 = 10. 2 µl/l air) was significantly more susceptible than T. confusum (LC50 = 497. 8 µl/l air). These results suggested that essential oil of L. citriodora could be used as a potential control agent against stored-product insects.
Language:
English
Published:
Journal Of Crop Protection, Volume:1 Issue:4, 2012
Pages:
313 - 320
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