Acaricidal activity of Cymbopogon citratus and Azadirachta indica against house dust mites
10.1016/S2221-1691(11)60081-6
- Author:
Hanifah Laili Azima
;
Awang Hazar Siti
;
Ming Tze Ho
;
Abidin Zainal Suhaili
;
Omar Hashima Maizatul
- Publication Type:Journal Article
- Keywords:
Acaricidal;
Lemongrass;
Neem House dust mites;
Cymbopogon citratus;
Azadirachta indica;
Dermatophagoides farinae;
Dermatophagoides pteronyssinus
- From:Asian Pacific Journal of Tropical Biomedicine
2011;(5):365-369
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To examine the acaricidal effects of the essential oil of Cymbopogon citratus leaf extract (lemongrass) and ethanolic Azadirachta indica leaf extract (neem) against house dust mites Dermatophagoides farinae (D. farinae) and Dermatophagoides pteronyssinus (D. pteronyssinus). Methods: Twenty-five adults mites were placed onto treated filter paper that is soaked with plant extract and been tested at different concentrations (50.00%, 25.00%, 12.50%, 6.25% and 3.13%) and exposure times (24hrs, 48hrs, 72hrs and 96 hrs). All treatments were replicated 7 times, and the experiment repeated once. The topical and contact activities of the two herbs were investigated.Results:Mortalities from lemongrass extract were higher than neem for both topical and contact activities. At 50 % concentration, both 24 hrs topical and contact exposures to lemongrass resulted in more than 91% mortalities for both species of mites. At the same concentration and exposure time, neem resulted in topical mortalities of 40.3% and 15.7% against D. pteronyssinus and D.farinae respectively; contact mortalities were 8.0% and 8.9% against the 2 mites, respectively. There was no difference in topical mortalities of D. pteronyssinus from exposure to concentrations of lemongrass and neem up to 12.50%; lemongrass was more effective than neem at the higher concentrations. Conclusions: Generally, topical mortalities of D. farinae due to lemongrass are higher than that due to neem. Contact mortalities of lemongrass are always higher that neem against both species of mites.
