Mosquito larvicidal activity of active constituent derived from Chamaecyparis obtusa leaves against 3 mosquito species
Autor(es): Jang, Young-Su; Jeon, Ju-Hyun; Lee, Hoi-Seon
Resumo: Mosqutio larvicidal activity of Chamaecyparis obtusa leaf-derived materials against the 4th-stage larvae of Aedes aegypti (L.), Ochlerotatus togoi (Theobald), and Culex pipiens pallens (Coquillett) was examined in the laboratory. A crude methanol extract of C. obtusa leaves was found to be active (percent mortality rough) against the 3 species larvae; the hexane fraction of the methanol extract showed a strong larvicidal activity (100% mortality) at 100 ppm. The bioactive component in the C. obtusa leaf extract was characterized as beta -thujaplicin by spectroscopic analyses. The LC sub(50) value of beta -thujaplicin was 2.91, 2.60, and 1.33 ppm against Ae. aegypti, Oc. togoi, and Cx. pipiens pallens larvae. This naturally occurring C. obtusa leaves-derived compound merits further study as a potential mosquito larval control agent or lead compound.
Palavras-Chave: Insect larvae; Pesticides; Leaves; Lead compounds; Pest control; Toxicity tests; Aquatic insects; Mortality causes; Mortality; Methanol; Larvicides; Biological activity; Aedes aegypti; Culex pipiens; Culex pipiens pallens; Culicidae; Ochlerotatus; Chamaecyparis obtusa
Imprenta: Journal of the American Mosquito Control Association, v. 21, n. 4, p. 400-403, 2005.
Descritores: Aedes aegypti - Larvicide
Data de publicação: 2005