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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_(50)and LC_(90) 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_(50) 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_(50)—LC_(90)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_(50)) 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.
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_ (50) and LC_ (90) 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_ (50) 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_ (50) -LC_ (90) of 54.3-140.3.65.5-155.6,86.8-180.7 and 95.3-192.6 for 1 st. 2nd and 3rd larval insiars. Respectively. The 5095 egg hatching inhibition concentration (IC_ (50) ) was noted at 16.5 mg / L.Conclusions: The present finding suggest that the C.indica l eaf essential oil provided an excellent potential for controlling An.slephemi mosquito at earlier stage of their life cycle.