Abstract
The essential oil obtained by hydrodistillation of the leaf of Parquetina nigrescens (Afzel) Bullock (Asclepiadaceae) was studied for the insecticidal activity using a conventional procedure. Different concentrations (50, 100, 150, 200 and 250 mg/mL) of P. nigrescens essential oil prepared separately and diluted in DMSO were tested on the maize weevil, Sitophilus zeamais. The essential oil displayed 100% mortality (fumigant toxicity) against S. zeamais adults at tested concentration of 150 mg/mL with lethal concentrations (LC50) of 46.14 mg/mL air. This is the first report on the insecticidal activity of essential oil of P. nigrescens and may be explore as a potential natural herbal plant for the control of insect pest.
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