LAUSR

We conducted laboratory experiments to investigate the repellent and insecticidal activity of Pelargonium graveolens geranium oil (GO) against larvae and adults of two dipteran species Musca domestica and Lucilia cuprina . The insecticidal activity of the GO was assessed on larvae using an immersion test, and on adults using impregnated filter paper and direct surface contact tests. Meanwhile, the repellent activity of the GO was assessed against adults of the two fly species. The results showed that P. graveolens GO had no larvicidal activity against both dipteran species. The lethal concentrations (LC 50 ) of GO after 15 min exposure were 3.0% and 2.5% in the direct surface application test, and 5.9% and 3.5% in the filter paper test, for M. domestica and L. cuprina , respectively. The GO of P. graveolens showed a repellent effect at a concentration of 1%. Our results suggest that P. graveolens GO has potential as a biopesticide for the control of M. domestica and L. cuprina and could provide an alternative to chemical insecticides.