Objective:To assess the larvicidal and egg hatching inhibition property of the leaf essential oil of Cocrinia indica（C.indica） against Anopheles stephensi（An.stephensi）.Methods:The larvicidal potential of C.indica...Objective:To assess the larvicidal and egg hatching inhibition property of the leaf essential oil of Cocrinia indica（C.indica） against Anopheles stephensi（An.stephensi）.Methods:The larvicidal potential of C.indica leaf essential oil was evaluated against 1st.2nd.3rd and 4th instars larvae of An.stephensi using WHO protocol.The 24h LC<sub>50</sub>and LC<sub>90</sub> values of the essential oil were determined following probit analysis.The egg hatching inhibition activity was also tested at 10.20.40.and 60 mg/L The IC<sub>50</sub> value of essential oil was determined against eggs of An. stephensi.Results:The essential oil extracted from C.indica possessed excellent larvicidal and egg hatching inhibition activity against An.stephensi.The bioassays showed LC<sub>50</sub>—LC<sub>90</sub>of 54.3- 140.3.65.5-155.6,86.8-180.7 and 95.3-192.6 for 1 st.2nd.3rd.and 4th larval insiars.respectively. The 5095 egg hatching inhibition concentration(IC<sub>50</sub>) was noted at 16.5 mg/L.Conclusions:The present finding suggest that the C.indica leaf essential oil provided an excellent potential for controlling An.slephemi mosquito at earlier stage of their life cycle.展开更多
文摘Objective:To assess the larvicidal and egg hatching inhibition property of the leaf essential oil of Cocrinia indica（C.indica） against Anopheles stephensi（An.stephensi）.Methods:The larvicidal potential of C.indica leaf essential oil was evaluated against 1st.2nd.3rd and 4th instars larvae of An.stephensi using WHO protocol.The 24h LC<sub>50</sub>and LC<sub>90</sub> values of the essential oil were determined following probit analysis.The egg hatching inhibition activity was also tested at 10.20.40.and 60 mg/L The IC<sub>50</sub> value of essential oil was determined against eggs of An. stephensi.Results:The essential oil extracted from C.indica possessed excellent larvicidal and egg hatching inhibition activity against An.stephensi.The bioassays showed LC<sub>50</sub>—LC<sub>90</sub>of 54.3- 140.3.65.5-155.6,86.8-180.7 and 95.3-192.6 for 1 st.2nd.3rd.and 4th larval insiars.respectively. The 5095 egg hatching inhibition concentration(IC<sub>50</sub>) was noted at 16.5 mg/L.Conclusions:The present finding suggest that the C.indica leaf essential oil provided an excellent potential for controlling An.slephemi mosquito at earlier stage of their life cycle.
