title: Insecticidal activities of leaf essential oils from Cinnamomum osmophloeum against three mosquito species.
abstract: The larvicidal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) trees were evaluated against three mosquito species. Results of larvicidal tests demonstrated that the leaf essential oils of cinnamaldehyde type and cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against Aedes albopictus larvae, and their LC(50) values in 24h were 40.8 microg/ml (LC(90)=81.7 microg/ml) and 46.5 microg/ml (LC(90)=83.3 microg/ml), respectively. Results of the 24-h mosquito larvicidal assays also showed that the effective constituents in leaf essential oils were trans-cinnamaldehyde and benzaldehyde and that the LC(50) values of these constituents against A. albopictus larvae were below 50 mug/ml. In addition, cinnamaldehyde type leaf essential oil and trans-cinnamaldehyde have also exhibited great larvicidal performance against Culex quinquefasciatus and Armigeres subalbatus larvae. Comparisons of mosquito larvicidal activity of trans-cinnamaldehyde congeners revealed that alpha-methyl cinnamaldehyde, benzaldehyde, and trans-cinnamaldehyde exhibited strong mosquito larvicidal activity.
authors.affiliation: Experimental Forest, National Taiwan University, Nan-Tou, Taiwan.
authors.forename: Sen-Sung
authors.initials: SS
authors.lastname: Cheng
authors.forename: Ju-Yun
authors.initials: JY
authors.lastname: Liu
authors.forename: Chin-Gi
authors.initials: CG
authors.lastname: Huang
authors.forename: Yen-Ray
authors.initials: YR
authors.lastname: Hsui
authors.forename: Wei-June
authors.initials: WJ
authors.lastname: Chen
authors.forename: Shang-Tzen
authors.initials: ST
authors.lastname: Chang
mesh_terms: D000818:Animals; D027424:Cinnamomum / Q000145:classification / Q000378:metabolism*; D009033:Culicidae / Q000145:classification / Q000187:drug effects*; D007306:Insecticides / Q000008:administration & dosage* / Q000737:chemistry*; D007814:Larva / Q000187:drug effects; D009822:Oils, Volatile / Q000737:chemistry* / Q000494:pharmacology*; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry; D018515:Plant Leaves / Q000145:classification / Q000378:metabolism*; D013045:Species Specificity; D015996:Survival Rate
chemical_list: D007306:Insecticides; D009822:Oils, Volatile; D010936:Plant Extracts