The essential oil from fresh leaf of Cinnamomum porrectum (Roxb.) was investigated at 3 different concentrations (0.5%, 1.5%. 2.5%) as well as its repellent and irritant properties against 3 laboratory targeted mosquitoes strains of Aedes aegypti, Ae. albopictus and Culex quinquefasciatus by using an excito-repellency test system. The mortality rate of female mosquitoes was observed following 24 h holding period post contact and non-contact trials to determine toxic property. The results showed that essential oil from C. porrectum leaf had a stronger toxicity response at the highest concentration (2.5%) when compared to other concentrations. Essential oil at 2.5% concentration gave the greatest number of knockdowns in all mosquito species (11.11-98.33%), with a high mortality rate in Ae. aegypti (28.33-35.00%) and Ae. albopictus (61.67-78.33%). Interestingly, a high knockdown rate was seen in Ae. aegypti at 1.5% oil concentration in both the contact and non-contact test (98.33%). The essential oils at 0.5% and 1.5% concentration showed repellent and irritant properties against Ae. albopictus and Cx. quinquefasciatus, with a high escape rate (25.00-92.72% escape) in all treated chambers tests. The greatest escape response from Ae. albopictus was recorded from 0.5% oil concentration (53.33% escape) in both contact and non-contact test, which higher than 1.5% concentration (25.00% escape) in the non-contact chamber (p&lt;0.05). However, there was no significant difference within the contact chamber of the both oil concentrations. Essential oil at 1.5% concentration produced the greatest response from Cx. quinquefasciatus in both the contact (89.65% escape) and non-contact (92.72% escape) chamber, with a significantly higher than 0.5% concentration in the non-contact trial (p&lt;0.05); while no statistically significant difference occurred in the contact chamber in either concentration. Furthermore, GC-MS analysis revealed that the main components of the essential oil were caryophyllene oxide (17.91%), citral (12.84%), caryophyllene (11.54%), neral (10.27%) and D-limonene (4.43%). This is the first study to report on the repellent and irritant properties of essential oil from C. porrectum leaf against Ae. albopictus and Cx. quinquefasciatus, except at the highest (2.5%) concentration.

Excito-repellency properties of Cinnamomum porrectum (Roxb.) leaf essential oil against laboratory populations of Aedes aegypti, Ae. albopictus and Culex quinquefasciatus (Diptera: Culicidae)

254th National Meeting (2017)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.