Abstract:
Botanical insecticides can be an alternative source for mosquito control because they
constitute a potential source of bioactive compound and typically are free from
harmful effects. This study was carrying out to search the alternative insecticides from
the natural product such as herbal plant, which is non toxic to environment and
biodegradable. The purposes of this study are to determine the toxicity effect of
Cymbopogon nardus crude on third instar Aedes aegypti and to compare the toxicity
of leaves and root extract. Leaves and root of C. nardus was extracted using 98.9%
methanol and tested against third instar Ae. aegypti larvae (Diptera: Culicidea) under
laboratory condition. Exposme was done for 24 hours in the concentration 4.0, 2.0,
1.0, 0.5 and 0.25mg/ml. The mean of LC5o of leaves was 2.3075 mg/ml and roots part
was 2.1835 mg/ml. Two samples mean of LC5o showed no significant difference in
both part of this plant (p > 0. 05). Developments of larval were completely inhibited by
the treatment of crude extract. This study indicates that both parts of C. nardus have
potential as larvacidal agents against Ae. aegypti.
