Autor(es): Panneerselvam, C.; Murugan, K.; Kovendan, K.; Kumar, P. Mahesh; Subramaniam, J.

Resumo: To explore the larvicidal and pupicidal activity of Euphorbia hirta (E hirta) leaf extract and Bacillus sphaericus (B. sphaericus) against the malarial vector, Anopheles stephensi (An. stephensi). The larvicidal and pupicidal activity was assayed against An. stephensi at various concentrations ranging from (75-375 ppm) under the laboratory as well as field conditions. The LC50 and LC90 value of the E. hirta leaf extract was determined by probit analysis. Results: The plant extract showed larvicidal effects after 24 Is of exposure; however, the highest larval mortality was found in the methanol extract of E. hirta against the first to fourth instars larvae and pupae of values LC50 = 137.40, 172.65, 217.81, 269.37 and 332.39 ppm; B. sphaericus against the first to fourth instars larvae and pupae of values LC50 = 44.29, 55.83, 68.51, 82.19 and 95.55 ppm, respectively. Moreover, combined treatment of values of LC50 = 79.13, 80.42, 86.01, 93.00 and 98.12 ppm, respectively. No mortality was observed in the control. These results suggest methanol leaf extracts of E. hirta and B. sphaericus have. potential to be used as an ideal eco-friendly approach for the control of the malarial vector, An. stephensi as target species of vector control programs. This study provides the first report on the combined mosquito larvicidal and pupicidal activity of this plant crude extract and bacterial toxin against An. stephensi mosquitoes.

Palavras-Chave: Euphorbia hirta; Anopheles stephensi; Bacillus sphaericus; Larvicidal and pupicidal activity; Field trial; Malarial vector

Imprenta: Asian Pacific Journal of Tropical Medicine, v. 6, n. 2, p. 102-109, 2013

Identificador do objeto digital: 10.1016/S1995-7645(13)60003-6

Descritores: Aedes aegypti - Repellent

Data de publicação: 2013

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