Abstract
Objective To assess the larvicidal and egg hatching inhibition property of the leaf essential oil of Coccinia 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 1st, 2nd, 3rd, and 4th larval instars, respectively. The 50% 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. stephensi mosquito at earlier stage of their life cycle.
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