Dose-dependent Pupicidal, Adulticidal and Ovicidal activities of leaf extracts of Tiliacora acuminata on Japanese encephalitis vector Culex vishnui group
Keywords:Tiliacora acuminate, Culex vishnui group, Pupicidal, Adulticidal, Ovicidal activity
Vector of Japanese encephalitis is Culex vishnui group of mosquito and control of that mosquito is facing threat due to emergence of resistance to synthetic insecticides. Insecticides of plant origin now act as suitable alternate for control of JE vector. To investigate dose-dependent pupicidal, adulticidal and ovicidal activities, crude and acetone extracts of leaf of Tiliacora acuminata were used against Cx. vishnui group of mosquito. In case of dose-dependent pupicidal activity, highest mortality observed at 1.5% concentration of crude extract and 75 ppm of acetone extract with 45.67% and 67.67% mortality respectively after 36 h of exposure followed by 24h and 12h. In case of adulticidal activity, highest mortality in crude extract was observed at 2.5% concentration with 73% of adult mosquitoes were dead, but in acetone extract at 120 ppm concentration shows nearly about 67% mortality of adult mosquitoes after 24 h of exposure. While in ovicidal activity at 0.5% crude extract have 11.67% egg hatching so nearly about 88.33% ovicidal activity takes place at this concentration. In acetone extract, there was nearly about 93.33% ovicidal activities at 55 ppm concentration. So leaf extracts of T. acuminata may be used as better pupicidal, adulticidal and ovicidal plant origin insecticide for control of Cx. vishnui group of mosquito. Further research is required to isolate and characterize the active principle of T. acuminata plant leaf extract.
. Hati, A.K. (1981). Vectors of Japanese encephalitis in India. Their bionomics and control. Bull. Calcutta Sch. Trop. Med., 29: 87–88.
. Venkatachalam, M.R. & Jebanesan, A. (2001). Repellent activity of Ferronia elephantum Corr. (Rutaceae) leaf extract against Aedes aegypti (L.). Bioresour. Technol., 76(3): 287–288.
. Rajkumar, S. & Jebanesan, A. (2004). Mosquitocidal activities of octacosane from Moschosma polystachyum Linn. (lamiaceae). J. Ethnopharmacol., 90(1): 87–89.
. Rajkumar, S. & Jebanesan, A. (2005). Oviposition deterrent and skin repellent activities of Solanum trilobatum leaf extract against the malarial vector Anopheles stephensi. J. Insect Sci., 5: 15-18.
. Das, N.G., Baruah, I., Talukdar, P.K. & Das, S.C. (2003). Evaluation of botanicals as repellents against mosquitoes. J. Vector Borne Dis., 40(1-2): 49–53.
. Shaalan, E.A.-S., Canyon, D., Younes, M.W.F., Abdel-Wahab, H. & Mansour, A.-H. (2005). A review of botanical phytochemicals with mosquitocidal potential. Environ. Int., 31(8): 1149–1166. doi: 10.1016/j.envint.2005.03.003.
. Mohan, L., Sharma, P. & Srivastava, C.N. (2006). Evaluation of Solanum xanthocarpum extract as a synergist for cypermethrin against larvae of the filarial vector Culex quinquefasciatus (Say). Entomol. Res., 36(4): 220–225. doi: 10.1111/j.1748-5967.2006.00037.x.
. Chowdhury, N., Bhattacharjee, I., Laskar, S. & Chandra, G. (2007). Efficacy of Solanum villosum Mill. (Solanaceae: Solanales) as a biocontrol agent against fourth instar larvae of Culex quinquefasciatus Say. Turk. J. Zoo., 31: 365–370.
. Ghosh, A., Chowdhury, N. & Chandra, G. (2008). Laboratory evaluation of a phytosteroid compound of mature leaves of Day Jasmine (Solanaceae: Solanales) against larvae of Culex quinquefasciatus (Diptera: Culicidae) and nontarget organisms. Parasitol. Res., 103(2): 271–277. doi: 10.1007/s00436-008-0963-y.
. Singha, S., Banerjee, S. & Chandra, G. (2011). Synergistic effect of Croton caudatus (fruits) and Tiliacora acuminata (flowers) extracts against filarial vector Culex quinquefasciatus. Asian Pacific Journal of Tropical Biomedicine, 1(2, Supplement): S159–S164. doi: 10.1016/S2221-1691(11)60147-0.
. Rawani, A., Ghosh, A. & Chandra, G. (2010). Mosquito larvicidal activities of Solanum nigrum L. leaf extract against Culex quinquefasciatus Say. Parasitol. Res., 107(5): 1235–1240. doi: 10.1007/s00436-010-1993-9.
. World Health Organization (1975). Resistance of vectors and reservoirs of disease to pesticides: twenty-second report of the WHO Expert Committee on Insecticides?. Geneva: World Health Organization. TRS/585.
. World Health Organization (1981). Instructions for determining the susceptibility or resistance of mosquito larvae to insecticides. Geneva: World Health Organization. WHO/VBC/81.807. 6 p.
. Chenniappan, K. & Kadarkarai, M. (2008). Oviposition deterrent, ovicidal and gravid mortality effects of ethanolic extract of Andrographis paniculata Nees against the malarial vector Anopheles stephensi Liston (Diptera: Culicidae). Entomol. Res., 38(2): 119–125. doi: 10.1111/j.1748-5967.2008.00147.x.
. Rajkumar, S. & Jebanesan, A. (2009). Larvicidal and oviposition activity of Cassia obtusifolia Linn (Family: Leguminosae) leaf extract against malarial vector, Anopheles stephensi Liston (Diptera: Culicidae). Parasitol. Res., 104(2): 337–340. doi: 10.1007/s00436-008-1197-8.