Chemical constituents and larvicidal property of the essential oil of Blumea mollis (D. Don) Merr. against Culex quinquefasciatus

Abstract

The essential oil from the leaves of Blumea mollis was extracted and the chemical constituents and the larvicidal against Culex quinquefasciatus effects studied. The analyses of gas chromatography (GC) and GC-mass spectroscopy (GC-MS) revealed that the leaf essential oil of B. mollis contained 39 compounds, and the major chemical compounds identified were linalool (19.43%), gamma-elemene (12.19%), copaene (10.93%), estragole (10.81%), Allo-ocimene (10.03%), gamma-terpinene (8.28%) and Allo-aromadendrene (7.44%). The essential oil had significant toxic effect against early fourth-instar larvae of C. quinquefasciatus with LC50=71.71 and LC90=143.41 ppm. The results could be useful in search of newer, safer and more effective natural larvicidal agent against C. quinquefasciatus.

Insecticidal and repellent activities of thymol from the essential oil of Trachyspermum ammi (Linn) Sprague seeds against Anopheles stephensi

“…Essential oil extraction Seeds (500 g) of T. ammi were steam distilled for 4-5 h in a clevenger type apparatus to extract the oil (Senthilkumar et al 2008). The gas chromatography of the essential oil was done on a Varian Gas Chromatogram, model CX-3400, under the conditions: carrier gas hydrogen, injector (detector FID) temperatures, 220°C and 225°C, respectively, capillary column (Supelcowax -10, 30 m×0.32 mm, film thickness 0.25 μm); and temperature programmed from 2 min at 40°C to 270°C at 5°C/min.…”

Bioefficacy of flindersine against Helicoverpa armigera Hübner, Spodoptera litura Fabricius, Anopheles stephensis Liston. and Culex quinquefasciatus Say.

“…Many researchers highlighted the effects of botanical pesticides on vector mosquitoes. Senthilkumar et al (2008) found that essential oil from Blumea mollis (Asteraceae) exhibited larvicidal activity on Cx. quinquefasciatus.…”

Chemical composition and mosquito larvicidal activities of Salvia essential oils

“…In S. splendens Blue Ribbon also the presence of β-cubebene, caryophyllene oxide, and caryophyllene may cause high mosquito larvicidal activity. Such activity has already been reported on these volatile terpenoids (Harbone & Baxter, 1983;Senthilkumar et al, 2008). Carvacrol and caryophyllene oxide were the main compounds responsible for the potent insecticidal activity of Lippia gracilis and Hyptis pectinata against Aedes aegypti larvae (Silva et al, 2008).…”